User equipment-specific scheduling request repetitions

ABSTRACT

Methods, systems, and devices for wireless communications are described. A base station and a user equipment (UE) may communicate in a high reliability and low latency communications system (e.g., ultra-reliable low latency communications (URLLC)). The base station may signal a UE-specific scheduling request (SR) repetition configuration that the UE may utilize to transmit an instantaneous SR when a buffer status report (BSR) is triggered by a new data packet. The UE may repeatedly transmit the SR until a number of repetitions or a time period of repetitions is met or an uplink grant is received from the base station. The SR repetition configuration may include a number of parameters including a repetition setting, power settings, a resource allocation, and an acknowledgement/negative acknowledgment (ACK/NACK) procedure.

CROSS REFERENCES

The present Application for Patent claims the benefit of U.S.Provisional Patent Application No. 62/563,011 by Li, et al., entitled“User Equipment-Specific Scheduling Request Repetitions,” filed Sep. 25,2017, assigned to the assignee hereof, and expressly incorporatedherein.

BACKGROUND

The following relates generally to wireless communication, and morespecifically to user equipment (UE)-specific scheduling request (SR)repetitions (e.g., retransmissions).

Wireless communications systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (e.g., time, frequency, and power). Examples of suchmultiple-access systems include fourth generation (4G) systems such as aLong Term Evolution (LTE) systems or LTE-Advanced (LTE-A) systems, andfifth generation (5G) systems which may be referred to as New Radio (NR)systems. These systems may employ technologies such as code divisionmultiple access (CDMA), time division multiple access (TDMA), frequencydivision multiple access (FDMA), orthogonal frequency division multipleaccess (OFDMA), or discrete Fourier transform-spread-OFDM (DFT-S-OFDM).A wireless multiple-access communications system may include a number ofbase stations or network access nodes, each simultaneously supportingcommunication for multiple communication devices, which may be otherwiseknown as UE.

In some wireless communications systems, a UE may transmit an SR to abase station to request resources for an uplink transmission. The SR maybe triggered when data becomes available for transmission. In somecases, the UE may wait to transmit the SR at periodic starting timesdesignated by the base station for SR transmissions. However, inwireless communications systems with high reliability and low latencyrequirements (e.g., ultra-reliable low latency communications (URLLC)),more efficient techniques for transmitting an SR more frequently may bedesired.

SUMMARY

The described techniques relate to improved methods, systems, devices,or apparatuses that support user equipment (UE)-specific schedulingrequest (SR) repetitions (e.g., retransmissions). Generally, thedescribed techniques provide for an SR repetition configuration thatenables the transmission of an instantaneous SR such that latency isreduced and reliability is improved. For example, the SR repetitionconfiguration may include an SR repetition number, an SR repetitionperiodicity, a starting symbol period to transmit a repetition of an SR,a power configuration to transmit a repetition of an SR, a configurationof an SR resource allocation to transmit a repetition of an SR, or acombination thereof. In some cases, an SR repetition parameter may begenerated to signify the SR repetition configuration. For example, theSR repetition parameter may be indicative of the different parameters ofthe SR repetition configuration. Additionally or alternatively, the SRrepetition parameter may include an index of the SR repetitionconfiguration. In some cases, the SR repetition configuration andparameter may be specific to a UE. For example, the SR repetitionconfiguration and parameter may be based on a traffic priority for theUE, a UE link budget, a latency requirement of the UE, a reliabilityrequirement of the UE, historical SR performance of the UE, a locationof the UE, or any combination thereof.

A base station may determine the UE-specific SR repetitionconfiguration, generate the SR repetition parameter based on the SRrepetition configuration, and transmit the SR repetition parameter to aUE. In some cases, the UE may transmit the repetition of an SR as partof ultra-reliable low latency communications (URLLC). In some cases, theUE may transmit the SR during an SR response window until a maximumnumber of SR repetitions is satisfied as indicated by the SR repetitionparameter. Additionally or alternatively, the UE may transmit the SRduring an SR response window until a resource grant is received from thebase station.

A method of wireless communication is described. The method may includereceiving, from a base station, a message comprising a SR repetitionparameter for the UE and transmitting a repetition of an SR to the basestation based on the received SR repetition parameter. The SR repetitionparameter may be UE-specific and based at least in part on one or moreof traffic priority for the UE, a UE link budget, a traffic latencyrequirement, or historical SR performance.

An apparatus for wireless communication is described. The apparatus mayinclude means for receiving, from a base station, a message comprising aSR repetition parameter for the UE and means for transmitting arepetition of an SR to the base station based on the received SRrepetition parameter. The SR repetition parameter may be UE-specific andbased at least in part on one or more of traffic priority for the UE, aUE link budget, a traffic latency requirement, or historical SRperformance.

Another apparatus for wireless communication is described. The apparatusmay include a processor, memory in electronic communication with theprocessor, and instructions stored in the memory. The instructions maybe operable to cause the processor to receive, from a base station, amessage comprising a SR repetition parameter for the UE and transmit arepetition of an SR to the base station based on the received SRrepetition parameter. The SR repetition parameter may be UE-specific andbased at least in part on one or more of traffic priority for the UE, aUE link budget, a traffic latency requirement, or historical SRperformance.

A non-transitory computer readable medium for wireless communication isdescribed. The non-transitory computer-readable medium may includeinstructions operable to cause a processor to receive, from a basestation, a message comprising a SR repetition parameter for the UE andtransmit a repetition of an SR to the base station based on the receivedSR repetition parameter. The SR repetition parameter may be UE-specificand based at least in part on one or more of traffic priority for theUE, a UE link budget, a traffic latency requirement, or historical SRperformance.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the SR repetition parametermay be indicative of an SR repetition number indicating a maximum numberof SR repetitions.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the SR repetition parametermay be indicative of an SR repetition periodicity.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the SR repetition parametermay be indicative of a starting symbol period to begin transmitting therepetition of the SR, the starting symbol period being based on an SRrepetition number and an SR repetition periodicity, where the repetitionof the SR may be transmitted using the starting symbol period.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the SR repetition parameterincludes an index of an SR repetition configuration for the UE.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for adjusting a transmission power fortransmitting the repetition of the SR based on the power configuration.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, adjusting the transmissionpower for transmitting the repetition of the SR includes increasing thetransmission power for the repetition of the SR in symbol periods knownby the UE to may have a channel condition that satisfies a threshold.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the SR repetition parametermay be indicative of the transmission power for transmitting therepetition of the SR based on an SR repetition number.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the SR repetition parametermay be indicative of an SR resource allocation, where the repetition ofthe SR may be transmitted on a set of time-frequency resources inaccordance with the SR resource allocation.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the SR resource allocation maybe indicative of transmitting the repetition of the SR using a hoppingpattern, or a same symbol period, or multiple symbol periods, or cyclicshifts in a single resource block, different radio frequency bands, orany combination thereof.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, transmitting the repetition ofthe SR includes transmitting the SR during an SR response window until amaximum number of SR repetitions may be satisfied.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, transmitting the repetition ofthe SR includes transmitting the SR during an SR response window until aresource grant may be received from the base station.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, transmitting the repetition ofthe SR includes transmitting the repetition of the SR in multiple slotsor subframes.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for identifying a collision between atransmission of a feedback message and the repetition of the SR. Someexamples of the method, apparatus, and non-transitory computer-readablemedium described above may further include processes, features, means,or instructions for determining a priority of the feedback message and apriority of the repetition of the SR. Some examples of the method,apparatus, and non-transitory computer-readable medium described abovemay further include processes, features, means, or instructions fortransmitting the feedback message, or the repetition of the SR, or both,based on the priority of the feedback message and the priority of therepetition of the SR.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the message includes a radioresource control (RRC) message or via a physical downlink controlchannel (PDCCH).

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the repetition of the SR maybe transmitted as part of URLLC.

A method of wireless communication is described. The method may includeidentifying channel conditions associated with a UE, determining a SRrepetition configuration for the UE based on the channel conditions,generating an SR repetition parameter for the UE based on the SRrepetition configuration, and transmitting the SR repetition parameterto the UE. The SR repetition configuration may be UE-specific and alsobased at least in part on one or more of traffic priority for the UE, aUE link budget, a traffic latency requirement, or historical SRperformance.

An apparatus for wireless communication is described. The apparatus mayinclude means for identifying channel conditions associated with a UE,means for determining a SR repetition configuration for the UE based onthe channel conditions, means for generating an SR repetition parameterfor the UE based on the SR repetition configuration, and means fortransmitting the SR repetition parameter to the UE. The SR repetitionconfiguration may be UE-specific and also based at least in part on oneor more of traffic priority for the UE, a UE link budget, a trafficlatency requirement, or historical SR performance.

Another apparatus for wireless communication is described. The apparatusmay include a processor, memory in electronic communication with theprocessor, and instructions stored in the memory. The instructions maybe operable to cause the processor to identify channel conditionsassociated with a UE, determine a SR repetition configuration for the UEbased on the channel conditions, generate an SR repetition parameter forthe UE based on the SR repetition configuration, and transmit the SRrepetition parameter to the UE. The SR repetition configuration may beUE-specific and also based at least in part on one or more of trafficpriority for the UE, a UE link budget, a traffic latency requirement, orhistorical SR performance.

A non-transitory computer readable medium for wireless communication isdescribed. The non-transitory computer-readable medium may includeinstructions operable to cause a processor to identify channelconditions associated with a UE, determine a SR repetition configurationfor the UE based on the channel conditions, generate an SR repetitionparameter for the UE based on the SR repetition configuration, andtransmit the SR repetition parameter to the UE. The SR repetitionconfiguration may be UE-specific and also based at least in part on oneor more of traffic priority for the UE, a UE link budget, a trafficlatency requirement, or historical SR performance.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for determining an SR repetition numberindicating a maximum number of SR repetitions by the UE, where the SRrepetition parameter may be indicative of the SR repetition number.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for determining an SR repetitionperiodicity for the UE to transmit a repetition of an SR, where the SRrepetition parameter may be indicative of the SR repetition periodicity.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for determining a starting symbolperiod for the UE to transmit a repetition of an SR, the starting symbolperiod being based on an SR repetition number and an SR repetitionperiodicity, where the SR repetition parameter may be indicative of thestarting symbol period.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the SR repetition parameterincludes an index of the SR repetition configuration.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for determining a power configurationfor the UE to transmit a repetition of an SR, the power configurationbeing based on the channel conditions, where the SR repetition parametermay be indicative of the power configuration.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the power configurationincludes an indication of the transmission power for transmitting therepetition of the SR based on an SR repetition number.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for configuring an SR resourceallocation for the UE to transmit a repetition of an SR, where the SRrepetition parameter may be indicative of the SR resource allocation.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the SR resource allocationindicates a set of time-frequency resources for the repetition of the SRusing a hopping pattern, or a same symbol period, or multiple symbolperiods, or cyclic shifts in a single resource block, different radiofrequency bands, or any combination thereof.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include processes,features, means, or instructions for receiving, from the UE, repetitionsof an SR during an SR response window in accordance with the SRrepetition configuration. Some examples of the method, apparatus, andnon-transitory computer-readable medium described above may furtherinclude processes, features, means, or instructions for decoding the SRbased on a combination of the received repetitions of the SR.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the SR repetitionconfiguration also may be based on reliability requirement of the UE, ora location of the UE, or any combination thereof.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the SR repetition parametermay be transmitted via RRC messaging or via a PDCCH.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a system for wireless communicationthat supports user equipment (UE)-specific scheduling request (SR)repetitions (e.g., retransmissions) in accordance with aspects of thepresent disclosure.

FIG. 2 illustrates an example of a wireless communications system thatsupports UE-specific SR repetitions (e.g., retransmissions) inaccordance with aspects of the present disclosure.

FIGS. 3A, 3B, and 3C illustrate examples of SR repetition resourceallocation configurations that support UE-specific SR repetitions (e.g.,retransmissions) in accordance with aspects of the present disclosure.

FIG. 4 illustrates an example of a process flow that supportsUE-specific SR repetitions (e.g., retransmissions) in accordance withaspects of the present disclosure.

FIGS. 5 through 7 show block diagrams of a device that supportsUE-specific SR repetitions (e.g., retransmissions) in accordance withaspects of the present disclosure.

FIG. 8 illustrates a block diagram of a system including a UE thatsupports UE-specific SR repetitions (e.g., retransmissions) inaccordance with aspects of the present disclosure.

FIGS. 9 through 11 show block diagrams of a device that supportsUE-specific SR repetitions (e.g., retransmissions) in accordance withaspects of the present disclosure.

FIG. 12 illustrates a block diagram of a system including a base stationthat supports UE-specific SR repetitions (e.g., retransmissions) inaccordance with aspects of the present disclosure.

FIGS. 13 through 18 illustrate methods for UE-specific SR repetitions(e.g., retransmissions) in accordance with aspects of the presentdisclosure.

DETAILED DESCRIPTION

A user equipment (UE) may transmit a scheduling request (SR) message toa base station requesting resources for an uplink transmission. The SRmay be in response to an event at the UE (e.g., a change in bufferstatus report (BSR) or uplink data arrival from a logical channelgroup). In some examples, the SR may convey the request for resourcesusing one or multiple bits. Once the SR is transmitted and received bythe base station, the base station may transmit an uplink grant (e.g.,downlink control information (DCI)), and the UE may transmit a messagein a physical uplink shared channel (PUSCH) in response to the uplinkgrant. In some cases, the base station may signal an SR configurationvia radio resource control (RRC) messaging to the UE for transmittingSRs. The configuration may include a starting point that indicates aperiodic starting time at which the UE may transmit an SR. Additionally,the configuration may include an SR response window where the UE waitsfor a response (e.g., an uplink grant) from the base station. If the UEdoes not receive a response within the window, it may retransmit the SR.

In some cases, the base station and UE may operate in a communicationssystem requiring high reliability and low latency transmissions betweendevices (e.g., ultra-reliable low latency communications (URLLC)). Insuch communications systems, the UE may transmit an instantaneous SRwhen a BSR is triggered by a new data packet instead of waiting for aperiodic starting time for transmitting SRs. Additionally, as describedherein, the base station may signal a UE-specific SR repetitionconfiguration that the UE may utilize in order to decrease the chancesof a missed detection of the SR by the base station and eliminate theneed to wait until the end of a response window to retransmit the SR.The UE may repeatedly transmit the SR until a number of repetitions or atime period of repetitions is met or an uplink grant is received fromthe base station. The base station may determine the UE-specific SRrepetition configuration based on UE-specific conditions, such astraffic priority, UE link budget, latency requirements, historicalrequirements, etc. In some cases, the base station may choose theUE-specific SR configuration from a table of available SR configurationsand signal an index corresponding to the chosen UE-specific SRconfiguration to the UE. The base station may transmit the UE-specificSR configuration in a semi-persistent signaling (e.g., RRC messaging) orin a dynamic signaling (e.g., physical downlink control channel(PDCCH)).

The SR repetition configuration may include a number of parametersincluding a repetition setting, power settings, a resource allocation,and an acknowledgement/negative acknowledgment (ACK/NACK) procedure. Therepetition setting parameter may include a number of repetitions for theSR, a time period for the repetitions, a starting point for therepetitions, or a combination thereof. The power settings may includepower boosts to certain repetitions of the SR based on channelconditions or based on latency requirements. The resource allocationparameter may include on which resources in a time-frequency domain totransmit the SR repetitions. The ACK/NACK procedure parameter mayinclude an indication of how the UE should respond when there is a needto transmit an ACK/NACK feedback in the same symbol as an SR.

Aspects of the disclosure are initially described in the context ofwireless communications systems. Examples of an SR repetitionconfiguration and a process flow are then described. Aspects of thedisclosure are further illustrated by and described with reference toapparatus diagrams, system diagrams, and flowcharts that relate toUE-specific scheduling request repetitions (e.g., retransmissions).

FIG. 1 illustrates an example of a wireless communications system 100 inaccordance with various aspects of the present disclosure. The wirelesscommunications system 100 includes base stations 105, UEs 115, and acore network 130. In some examples, the wireless communications system100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A)network, or a New Radio (NR) network. In some cases, wirelesscommunications system 100 may support enhanced broadband communications,ultra-reliable (e.g., mission critical) communications, low latencycommunications, or communications with low-cost and low-complexitydevices (e.g., URLLC).

Base stations 105 may wirelessly communicate with UEs 115 via one ormore base station antennas. Base stations 105 described herein mayinclude or may be referred to by those skilled in the art as a basetransceiver station, a radio base station, an access point, a radiotransceiver, a NodeB, an eNodeB (eNB), a next-generation Node B orgiga-nodeB (either of which may be referred to as a gNB), a Home NodeB,a Home eNodeB, or some other suitable terminology. Wirelesscommunications system 100 may include base stations 105 of differenttypes (e.g., macro or small cell base stations). The UEs 115 describedherein may be able to communicate with various types of base stations105 and network equipment including macro eNBs, small cell eNBs, gNBs,relay base stations, and the like.

Each base station 105 may be associated with a particular geographiccoverage area 110 in which communications with various UEs 115 issupported. Each base station 105 may provide communication coverage fora respective geographic coverage area 110 via communication links 125,and communication links 125 between a base station 105 and a UE 115 mayutilize one or more carriers. Communication links 125 shown in wirelesscommunications system 100 may include uplink transmissions from a UE 115to a base station 105, or downlink transmissions, from a base station105 to a UE 115. Downlink transmissions may also be called forward linktransmissions while uplink transmissions may also be called reverse linktransmissions.

The geographic coverage area 110 for a base station 105 may be dividedinto sectors making up only a portion of the geographic coverage area110, and each sector may be associated with a cell. For example, eachbase station 105 may provide communication coverage for a macro cell, asmall cell, a hot spot, or other types of cells, or various combinationsthereof. In some examples, a base station 105 may be movable andtherefore provide communication coverage for a moving geographiccoverage area 110. In some examples, different geographic coverage areas110 associated with different technologies may overlap, and overlappinggeographic coverage areas 110 associated with different technologies maybe supported by the same base station 105 or by different base stations105. The wireless communications system 100 may include, for example, aheterogeneous LTE/LTE-A or NR network in which different types of basestations 105 provide coverage for various geographic coverage areas 110.

The term “cell” refers to a logical communication entity used forcommunication with a base station 105 (e.g., over a carrier), and may beassociated with an identifier for distinguishing neighboring cells(e.g., a physical cell identifier (PCID), a virtual cell identifier(VCID)) operating via the same or a different carrier. In some examples,a carrier may support multiple cells, and different cells may beconfigured according to different protocol types (e.g., machine-typecommunication (MTC), narrowband Internet-of-Things (NB-IoT), enhancedmobile broadband (eMBB), or others) that may provide access fordifferent types of devices. In some cases, the term “cell” may refer toa portion of a geographic coverage area 110 (e.g., a sector) over whichthe logical entity operates.

UEs 115 may be dispersed throughout the wireless communications system100, and each UE 115 may be stationary or mobile. A UE 115 may also bereferred to as a mobile device, a wireless device, a remote device, ahandheld device, or a subscriber device, or some other suitableterminology, where the “device” may also be referred to as a unit, astation, a terminal, or a client. A UE 115 may be a personal electronicdevice such as a cellular phone, a personal digital assistant (PDA), atablet computer, a laptop computer, or a personal computer. In someexamples, a UE 115 may also refer to a wireless local loop (WLL)station, an Internet of Things (IoT) device, an Internet of Everything(IoE) device, or an MTC device, or the like, which may be implemented invarious articles such as appliances, vehicles, meters, or the like.

Some UEs 115, such as MTC or IoT devices, may be low cost or lowcomplexity devices, and may provide for automated communication betweenmachines (e.g., via Machine-to-Machine (M2M) communication). M2Mcommunication or MTC may refer to data communication technologies thatallow devices to communicate with one another or a base station 105without human intervention. In some examples, M2M communication or MTCmay include communications from devices that integrate sensors or metersto measure or capture information and relay that information to acentral server or application program that can make use of theinformation or present the information to humans interacting with theprogram or application. Some UEs 115 may be designed to collectinformation or enable automated behavior of machines. Examples ofapplications for MTC devices include smart metering, inventorymonitoring, water level monitoring, equipment monitoring, healthcaremonitoring, wildlife monitoring, weather and geological eventmonitoring, fleet management and tracking, remote security sensing,physical access control, and transaction-based business charging.

Some UEs 115 may be configured to employ operating modes that reducepower consumption, such as half-duplex communications (e.g., a mode thatsupports one-way communication via transmission or reception, but nottransmission and reception simultaneously). In some examples half-duplexcommunications may be performed at a reduced peak rate. Other powerconservation techniques for UEs 115 include entering a power saving“deep sleep” mode when not engaging in active communications, oroperating over a limited bandwidth (e.g., according to narrowbandcommunications). In some cases, UEs 115 may be designed to supportcritical functions (e.g., mission critical functions), and a wirelesscommunications system 100 may be configured to provide ultra-reliablecommunications for these functions.

In some cases, a UE 115 may also be able to communicate directly withother UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device(D2D) protocol). One or more of a group of UEs 115 utilizing D2Dcommunications may be within the geographic coverage area 110 of a basestation 105. Other UEs 115 in such a group may be outside the geographiccoverage area 110 of a base station 105, or be otherwise unable toreceive transmissions from a base station 105. In some cases, groups ofUEs 115 communicating via D2D communications may utilize a one-to-many(1:M) system in which each UE 115 transmits to every other UE 115 in thegroup. In some cases, a base station 105 facilitates the scheduling ofresources for D2D communications. In other cases, D2D communications arecarried out between UEs 115 without the involvement of a base station105.

Base stations 105 may communicate with the core network 130 and with oneanother. For example, base stations 105 may interface with the corenetwork 130 through backhaul links 132 (e.g., via an Si or otherinterface). Base stations 105 may communicate with one another overbackhaul links 134 (e.g., via an X2 or other interface) either directly(e.g., directly between base stations 105) or indirectly (e.g., via corenetwork 130).

The core network 130 may provide user authentication, accessauthorization, tracking, Internet Protocol (IP) connectivity, and otheraccess, routing, or mobility functions. The core network 130 may be anevolved packet core (EPC), which may include at least one mobilitymanagement entity (MME), at least one serving gateway (S-GW), and atleast one Packet Data Network (PDN) gateway (P-GW). The MME may managenon-access stratum (e.g., control plane) functions such as mobility,authentication, and bearer management for UEs 115 served by basestations 105 associated with the EPC. User IP packets may be transferredthrough the S-GW, which itself may be connected to the P-GW. The P-GWmay provide IP address allocation as well as other functions. The P-GWmay be connected to the network operators IP services. The operators IPservices may include access to the Internet, Intranet(s), an IPMultimedia Subsystem (IMS), or a Packet-Switched (PS) Streaming Service.

At least some of the network devices, such as a base station 105, mayinclude subcomponents such as an access network entity, which may be anexample of an access node controller (ANC). Each access network entitymay communicate with UEs 115 through a number of other access networktransmission entities, which may be referred to as a radio head, a smartradio head, or a transmission/reception point (TRP). In someconfigurations, various functions of each access network entity or basestation 105 may be distributed across various network devices (e.g.,radio heads and access network controllers) or consolidated into asingle network device (e.g., a base station 105).

Wireless communications system 100 may operate using one or morefrequency bands, typically in the range of 300 MHz to 300 GHz.Generally, the region from 300 MHz to 3 GHz is known as the ultra-highfrequency (UHF) region or decimeter band, since the wavelengths rangefrom approximately one decimeter to one meter in length. UHF waves maybe blocked or redirected by buildings and environmental features.However, the waves may penetrate structures sufficiently for a macrocell to provide service to UEs 115 located indoors. Transmission of UHFwaves may be associated with smaller antennas and shorter range (e.g.,less than 100 km) compared to transmission using the smaller frequenciesand longer waves of the high frequency (HF) or very high frequency (VHF)portion of the spectrum below 300 MHz.

Wireless communications system 100 may also operate in a super highfrequency (SHF) region using frequency bands from 3 GHz to 30 GHz, alsoknown as the centimeter band. The SHF region includes bands such as the5 GHz industrial, scientific, and medical (ISM) bands, which may be usedopportunistically by devices that can tolerate interference from otherusers.

Wireless communications system 100 may also operate in an extremely highfrequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz),also known as the millimeter band. In some examples, wirelesscommunications system 100 may support millimeter wave (mmW)communications between UEs 115 and base stations 105, and EHF antennasof the respective devices may be even smaller and more closely spacedthan UHF antennas. In some cases, this may facilitate use of antennaarrays within a UE 115. However, the propagation of EHF transmissionsmay be subject to even greater atmospheric attenuation and shorter rangethan SHF or UHF transmissions. Techniques disclosed herein may beemployed across transmissions that use one or more different frequencyregions, and designated use of bands across these frequency regions maydiffer by country or regulating body.

In some cases, wireless communications system 100 may utilize bothlicensed and unlicensed radio frequency spectrum bands. For example,wireless communications system 100 may employ License Assisted Access(LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technologyin an unlicensed band such as the 5 GHz ISM band. When operating inunlicensed radio frequency spectrum bands, wireless devices such as basestations 105 and UEs 115 may employ listen-before-talk (LBT) proceduresto ensure a frequency channel is clear before transmitting data. In somecases, operations in unlicensed bands may be based on a CA configurationin conjunction with CCs operating in a licensed band (e.g., LAA).Operations in unlicensed spectrum may include downlink transmissions,uplink transmissions, peer-to-peer transmissions, or a combination ofthese. Duplexing in unlicensed spectrum may be based on frequencydivision duplexing (FDD), time division duplexing (TDD), or acombination of both.

In some examples, base station 105 or UE 115 may be equipped withmultiple antennas, which may be used to employ techniques such astransmit diversity, receive diversity, multiple-input multiple-output(MIMO) communications, or beamforming. For example, wirelesscommunications system 100 may use a transmission scheme between atransmitting device (e.g., a base station 105) and a receiving device(e.g., a UE 115), where the transmitting device is equipped withmultiple antennas and the receiving devices are equipped with one ormore antennas. MIMO communications may employ multipath signalpropagation to increase the spectral efficiency by transmitting orreceiving multiple signals via different spatial layers, which may bereferred to as spatial multiplexing. The multiple signals may, forexample, be transmitted by the transmitting device via differentantennas or different combinations of antennas. Likewise, the multiplesignals may be received by the receiving device via different antennasor different combinations of antennas. Each of the multiple signals maybe referred to as a separate spatial stream, and may carry bitsassociated with the same data stream (e.g., the same codeword) ordifferent data streams. Different spatial layers may be associated withdifferent antenna ports used for channel measurement and reporting. MIMOtechniques include single-user MIMO (SU-MIMO) where multiple spatiallayers are transmitted to the same receiving device, and multiple-userMIMO (MU-MIMO) where multiple spatial layers are transmitted to multipledevices.

Beamforming, which may also be referred to as spatial filtering,directional transmission, or directional reception, is a signalprocessing technique that may be used at a transmitting device or areceiving device (e.g., a base station 105 or a UE 115) to shape orsteer an antenna beam (e.g., a transmit beam or receive beam) along aspatial path between the transmitting device and the receiving device.Beamforming may be achieved by combining the signals communicated viaantenna elements of an antenna array such that signals propagating atparticular orientations with respect to an antenna array experienceconstructive interference while others experience destructiveinterference. The adjustment of signals communicated via the antennaelements may include a transmitting device or a receiving deviceapplying certain amplitude and phase offsets to signals carried via eachof the antenna elements associated with the device. The adjustmentsassociated with each of the antenna elements may be defined by abeamforming weight set associated with a particular orientation (e.g.,with respect to the antenna array of the transmitting device orreceiving device, or with respect to some other orientation).

In one example, a base station 105 may use multiple antennas or antennaarrays to conduct beamforming operations for directional communicationswith a UE 115. For instance, some signals (e.g. synchronization signals,reference signals, beam selection signals, or other control signals) maybe transmitted by a base station 105 multiple times in differentdirections, which may include a signal being transmitted according todifferent beamforming weight sets associated with different directionsof transmission. Transmissions in different beam directions may be usedto identify (e.g., by the base station 105 or a receiving device, suchas a UE 115) a beam direction for subsequent transmission and/orreception by the base station 105. Some signals, such as data signalsassociated with a particular receiving device, may be transmitted by abase station 105 in a single beam direction (e.g., a directionassociated with the receiving device, such as a UE 115). In someexamples, the beam direction associated with transmissions along asingle beam direction may be determined based at least in in part on asignal that was transmitted in different beam directions. For example, aUE 115 may receive one or more of the signals transmitted by the basestation 105 in different directions, and the UE 115 may report to thebase station 105 an indication of the signal it received with a highestsignal quality, or an otherwise acceptable signal quality. Althoughthese techniques are described with reference to signals transmitted inone or more directions by a base station 105, a UE 115 may employsimilar techniques for transmitting signals multiple times in differentdirections (e.g., for identifying a beam direction for subsequenttransmission or reception by the UE 115), or transmitting a signal in asingle direction (e.g., for transmitting data to a receiving device).

A receiving device (e.g., a UE 115, which may be an example of a mmWreceiving device) may try multiple receive beams when receiving varioussignals from the base station 105, such as synchronization signals,reference signals, beam selection signals, or other control signals. Forexample, a receiving device may try multiple receive directions byreceiving via different antenna subarrays, by processing receivedsignals according to different antenna subarrays, by receiving accordingto different receive beamforming weight sets applied to signals receivedat a plurality of antenna elements of an antenna array, or by processingreceived signals according to different receive beamforming weight setsapplied to signals received at a plurality of antenna elements of anantenna array, any of which may be referred to as “listening” accordingto different receive beams or receive directions. In some examples areceiving device may use a single receive beam to receive along a singlebeam direction (e.g., when receiving a data signal). The single receivebeam may be aligned in a beam direction determined based at least inpart on listening according to different receive beam directions (e.g.,a beam direction determined to have a highest signal strength, highestsignal-to-noise ratio, or otherwise acceptable signal quality based atleast in part on listening according to multiple beam directions).

In some cases, the antennas of a base station 105 or UE 115 may belocated within one or more antenna arrays, which may support MIMOoperations, or transmit or receive beamforming. For example, one or morebase station antennas or antenna arrays may be co-located at an antennaassembly, such as an antenna tower. In some cases, antennas or antennaarrays associated with a base station 105 may be located in diversegeographic locations. A base station 105 may have an antenna array witha number of rows and columns of antenna ports that the base station 105may use to support beamforming of communications with a UE 115.Likewise, a UE 115 may have one or more antenna arrays that may supportvarious MIMO or beamforming operations.

In some cases, wireless communications system 100 may be a packet-basednetwork that operate according to a layered protocol stack. In the userplane, communications at the bearer or Packet Data Convergence Protocol(PDCP) layer may be IP-based. A Radio Link Control (RLC) layer may insome cases perform packet segmentation and reassembly to communicateover logical channels. A Medium Access Control (MAC) layer may performpriority handling and multiplexing of logical channels into transportchannels. The MAC layer may also use hybrid automatic repeat request(HARD) to provide retransmission at the MAC layer to improve linkefficiency. In the control plane, the Radio Resource Control (RRC)protocol layer may provide establishment, configuration, and maintenanceof an RRC connection between a UE 115 and a base station 105 or corenetwork 130 supporting radio bearers for user plane data. At thePhysical (PHY) layer, transport channels may be mapped to physicalchannels.

In some cases, UEs 115 and base stations 105 may support retransmissionsof data to increase the likelihood that data is received successfully.HARQ feedback is one technique of increasing the likelihood that data isreceived correctly over a communication link 125. HARQ may include acombination of error detection (e.g., using a cyclic redundancy check(CRC)), forward error correction (FEC), and retransmission (e.g.,automatic repeat request (ARQ)). HARQ may improve throughput at the MAClayer in poor radio conditions (e.g., signal-to-noise conditions). Insome cases, a wireless device may support same-slot HARQ feedback, wherethe device may provide HARQ feedback in a specific slot for datareceived in a previous symbol in the slot. In other cases, the devicemay provide HARQ feedback in a subsequent slot, or according to someother time interval.

Time intervals in LTE or NR may be expressed in multiples of a basictime unit, which may, for example, refer to a sampling period ofT_(s)=1/30,720,000 seconds. Time intervals of a communications resourcemay be organized according to radio frames each having a duration of 10milliseconds (ms), where the frame period may be expressed asT_(f)=307,200 T_(s). The radio frames may be identified by a systemframe number (SFN) ranging from 0 to 1023. Each frame may include 10subframes numbered from 0 to 9, and each subframe may have a duration of1 ms. A subframe may be further divided into 2 slots each having aduration of 0.5 ms, and each slot may contain 6 or 7 modulation symbolperiods (e.g., depending on the length of the cyclic prefix prepended toeach symbol period). Excluding the cyclic prefix, each symbol period maycontain 2048 sampling periods. In some cases a subframe may be thesmallest scheduling unit of the wireless communications system 100, andmay be referred to as a transmission time interval (TTI). In othercases, a smallest scheduling unit of the wireless communications system100 may be shorter than a subframe or may be dynamically selected (e.g.,in bursts of shortened TTIs (sTTIs) or in selected component carriersusing sTTIs).

In some wireless communications systems, a slot may further be dividedinto multiple mini-slots containing one or more symbols. In someinstances, a symbol of a mini-slot or a mini-slot may be the smallestunit of scheduling. Each symbol may vary in duration depending on thesubcarrier spacing or frequency band of operation, for example. Further,some wireless communications systems may implement slot aggregation inwhich multiple slots or mini-slots are aggregated together and used forcommunication between a UE 115 and a base station 105.

The term “carrier” refers to a set of radio frequency spectrum resourceshaving a defined physical layer structure for supporting communicationsover a communication link 125. For example, a carrier of a communicationlink 125 may include a portion of a radio frequency spectrum band thatis operated according to physical layer channels for a given radioaccess technology. Each physical layer channel may carry user data,control information, or other signaling. A carrier may be associatedwith a pre-defined frequency channel (e.g., an E-UTRA absolute radiofrequency channel number (EARFCN)), and may be positioned according to achannel raster for discovery by UEs 115. Carriers may be downlink oruplink (e.g., in an FDD mode), or be configured to carry downlink anduplink communications (e.g., in a TDD mode). In some examples, signalwaveforms transmitted over a carrier may be made up of multiplesub-carriers (e.g., using multi-carrier modulation (MCM) techniques suchas orthogonal frequency division multiplexing (OFDM) or discrete Fouriertransform-spread-OFDM (DFT-s-OFDM)).

The organizational structure of the carriers may be different fordifferent radio access technologies (e.g., LTE, LTE-A, NR, etc.). Forexample, communications over a carrier may be organized according toTTIs or slots, each of which may include user data as well as controlinformation or signaling to support decoding the user data. A carriermay also include dedicated acquisition signaling (e.g., synchronizationsignals or system information, etc.) and control signaling thatcoordinates operation for the carrier. In some examples (e.g., in acarrier aggregation configuration), a carrier may also have acquisitionsignaling or control signaling that coordinates operations for othercarriers.

Physical channels may be multiplexed on a carrier according to varioustechniques. A physical control channel and a physical data channel maybe multiplexed on a downlink carrier, for example, using time divisionmultiplexing (TDM) techniques, frequency division multiplexing (FDM)techniques, or hybrid TDM-FDM techniques. In some examples, controlinformation transmitted in a physical control channel may be distributedbetween different control regions in a cascaded manner (e.g., between acommon control region or common search space and one or more UE-specificcontrol regions or UE-specific search spaces).

A carrier may be associated with a particular bandwidth of the radiofrequency spectrum, and in some examples the carrier bandwidth may bereferred to as a “system bandwidth” of the carrier or the wirelesscommunications system 100. For example, the carrier bandwidth may be oneof a number of predetermined bandwidths for carriers of a particularradio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). Insome examples, each served UE 115 may be configured for operating overportions or all of the carrier bandwidth. In other examples, some UEs115 may be configured for operation using a narrowband protocol typethat is associated with a predefined portion or range (e.g., set ofsubcarriers or RBs) within a carrier (e.g., “in-band” deployment of anarrowband protocol type).

In a system employing MCM techniques, a resource element may consist ofone symbol period (e.g., a duration of one modulation symbol) and onesubcarrier, where the symbol period and subcarrier spacing are inverselyrelated. The number of bits carried by each resource element may dependon the modulation scheme (e.g., the order of the modulation scheme).Thus, the more resource elements that a UE 115 receives and the higherthe order of the modulation scheme, the higher the data rate may be forthe UE 115. In MIMO systems, a wireless communications resource mayrefer to a combination of a radio frequency spectrum resource, a timeresource, and a spatial resource (e.g., spatial layers), and the use ofmultiple spatial layers may further increase the data rate forcommunications with a UE 115.

Devices of the wireless communications system 100 (e.g., base stations105 or UEs 115) may have a hardware configuration that supportscommunications over a particular carrier bandwidth, or may beconfigurable to support communications over one of a set of carrierbandwidths. In some examples, the wireless communications system 100 mayinclude base stations 105 and/or UEs that can support simultaneouscommunications via carriers associated with more than one differentcarrier bandwidth.

Wireless communications system 100 may support communication with a UE115 on multiple cells or carriers, a feature which may be referred to ascarrier aggregation (CA) or multi-carrier operation. A UE 115 may beconfigured with multiple downlink CCs and one or more uplink CCsaccording to a carrier aggregation configuration. Carrier aggregationmay be used with both FDD and TDD component carriers.

In some cases, wireless communications system 100 may utilize enhancedcomponent carriers (eCCs). An eCC may be characterized by one or morefeatures including wider carrier or frequency channel bandwidth, shortersymbol duration, shorter TTI duration, or modified control channelconfiguration. In some cases, an eCC may be associated with a carrieraggregation configuration or a dual connectivity configuration (e.g.,when multiple serving cells have a suboptimal or non-ideal backhaullink). An eCC may also be configured for use in unlicensed spectrum orshared spectrum (e.g., where more than one operator is allowed to usethe spectrum). An eCC characterized by wide carrier bandwidth mayinclude one or more segments that may be utilized by UEs 115 that arenot capable of monitoring the whole carrier bandwidth or are otherwiseconfigured to use a limited carrier bandwidth (e.g., to conserve power).

In some cases, an eCC may utilize a different symbol duration than otherCCs, which may include use of a reduced symbol duration as compared withsymbol durations of the other CCs. A shorter symbol duration may beassociated with increased spacing between adjacent subcarriers. Adevice, such as a UE 115 or base station 105, utilizing eCCs maytransmit wideband signals (e.g., according to frequency channel orcarrier bandwidths of 20, 40, 60, 80 MHz, etc.) at reduced symboldurations (e.g., 16.67 microseconds). A TTI in eCC may consist of one ormultiple symbol periods. In some cases, the TTI duration (that is, thenumber of symbol periods in a TTI) may be variable.

Wireless communications systems such as an NR system may utilize anycombination of licensed, shared, and unlicensed spectrum bands, amongothers. The flexibility of eCC symbol duration and subcarrier spacingmay allow for the use of eCC across multiple spectrums. In someexamples, NR shared spectrum may increase spectrum utilization andspectral efficiency, specifically through dynamic vertical (e.g., acrossfrequency) and horizontal (e.g., across time) sharing of resources.

Wireless communications system 100 may provide low latency services withhigh reliability as may be desired in certain applications (e.g., remotecontrol, wireless automation of production facilities, vehicular trafficefficiency and safety, mobile gaming, etc.). URLLC is an example of alow latency service with high reliability. In such wirelesscommunications, a base station 105 may transmit URLLC data to a UE 115,and the UE 115 may need to immediately transmit ACK/NACK feedback.

In some cases, UE 115 may transmit an SR message to a base station 105requesting resources for an uplink transmission. The MAC of the UE 115may trigger the SR in response to an event at the UE 115 (e.g., a changein BSR or uplink data arrival from a logical channel group). Once the SRis transmitted and received by the base station 105, the base station105 may transmit an uplink grant (e.g., in DCI 0 format), and the UE 115may transmit a message in a PUSCH in response to the uplink grant. Insome cases, the base station 105 may signal an SR configuration via RRCmessaging to the UE 115 for transmitting SRs. The configuration mayinclude a starting point that indicates a periodic starting time atwhich the UE 115 may transmit an SR. Additionally, the configuration mayinclude an SR response window where the UE 115 waits for a response(e.g., an uplink grant) from the base station 105. If the UE 115 doesnot receive a response within the window, it may retransmit the SR. Thetiming among the SR, uplink grant, and PUSCH transmission may varyaccording to the transmission scheme (e.g., FDD, TDD, etc.). In somecases, waiting for the starting period to transmit the SR or waiting toretransmit the SR after the response window time expires may increasethe latency of the SR transmission.

Wireless communications system 100 may support efficient techniques forconfiguring and utilizing an SR repetition scheme. A base station 105and UE 115 may communicate in a high reliability (e.g., less than 0.001%block error rate) and low latency (e.g., less than 2 ms) communicationssystem (e.g., URLLC). In such communications systems, the UE 115 maytransmit an instantaneous SR when a BSR is triggered by a new datapacket instead of waiting for a periodic starting time for transmittingSRs. Additionally, as described herein, the base station 105 may signala UE-specific SR repetition configuration that the UE 115 may utilize inorder to decrease the chances of a missed detection of the SR by thebase station 105 and eliminate the need to wait until the end of aresponse window to retransmit the SR. The UE 115 may repeatedly transmitthe SR until a number of repetitions or a time period of repetitions ismet or an uplink grant is received from the base station 105. The basestation 105 may determine the UE-specific SR repetition configurationbased on UE-specific conditions for the UE 115, such as trafficpriority, UE link budget, latency requirements, historical requirements,etc. In some cases, the base station 105 may choose the UE-specific SRconfiguration from a table of available SR configurations and signal anindex corresponding to the chosen UE-specific SR configuration to the UE115. The base station 105 may transmit the UE-specific SR configurationin a semi-persistent signaling (e.g., RRC messaging) or in a dynamicsignaling (e.g., PDCCH).

The SR repetition configuration may include a number of parametersincluding a repetition setting, power settings, a resource allocation,and an ACK/NACK procedure. The repetition setting parameter may includea number of repetitions for the SR, a time period for the repetitions, astarting point for the repetitions, or a combination thereof. The powersettings may include power boosts to certain repetitions of the SR basedon channel conditions or based on latency requirements. The resourceallocation parameter may include on which resources in a time-frequencydomain to transmit the SR repetitions. For example, the resourceallocation may include a hopping pattern, allocating multiple resourceswithin the same symbol, or cyclic shifts of resources between resourceblocks. The ACK/NACK procedure parameter may include an indication ofhow the UE 115 should respond when there is a need to transmit anACK/NACK feedback in response to URLLC data and an SR in the samesymbol. For example, the UE 115 may multiplex the SR and ACK/NACKfeedback together or transmit either the SR or ACK/NACK feedback basedon a priority between the two transmissions.

FIG. 2 illustrates an example of a wireless communications system 200that supports UE-specific SR repetitions (e.g., retransmissions) inaccordance with various aspects of the present disclosure. In someexamples, wireless communications system 200 may implement aspects ofwireless communications system 100. In some examples, wirelesscommunications system 200 may operate in a URLLC system. A base station105-a may indicate an SR repetition parameter 210 corresponding to an SRrepetition configuration specific to a UE 115-a on resources of acarrier 205 to UE 115-a. Accordingly, UE 115-a may transmit one or moreSR repetitions 220 corresponding to the SR repetition configuration onresources of a carrier 215.

In some cases, base station 105-a may determine the SR repetitionconfiguration for UE 115-a based on specific conditions for UE 115-a. Insome cases, these UE-specific conditions may include a traffic priority,UE link budget, latency requirements, historical requirements, etc. Insome cases, base station 105-a may choose the UE-specific SRconfiguration from a table of available SR configurations and signal anindex corresponding to the chosen UE-specific SR configuration to UE115-a. Additionally, base station 105-a may transmit the SR repetitionparameter 210 corresponding to the UE-specific SR configuration viasemi-persistent signaling (e.g., RRC messaging) or via dynamic signaling(e.g., PDCCH) on carrier 205. The SR repetition configuration mayinclude a number of parameters including a repetition setting, powersettings, a resource allocation, and an ACK/NACK procedure.

The repetition setting parameter may include a number of repetitions forthe SR, a time period for the repetitions, a starting point for therepetitions, or a combination thereof. For example, base station 105-amay select a certain number of SR repetitions for UE 115-a based onrequirements of reliability and latency. In some cases, a higher numberof repetitions (e.g., four (4)) may be chosen for UE 115-a if it isfarther from base station 105-a (i.e., cell-edge UE) and, as a result,has a lower link budget. Alternatively, a lower number of repetitions(e.g., zero (0) or one (1)) may be chosen if UE 115-a is closer to basestation 105-a (i.e., cell-center UE) and, as a result, has a higher linkbudget. In general, the lower the expected losses and the better thelink budget may result in a lower number of chosen repetitions becauseof the higher reliability of the base station correctly receiving the SRat a quicker time (i.e., lower latency). However, base station 105-a maychoose more or fewer repetitions based on other UE-specific conditionsas specified above.

Additionally or alternatively, base station 105-a may choose a timeperiod for the repetitions based on latency requirements. For example,base station 105-a may choose a short repetition period (e.g., one (1)or two (2) OFDM symbols, etc.) for UEs 115 with lower latencyrequirements. Additionally, base station 105-a may choose a startingpoint for the repetitions based on latency requirements (i.e., a morefrequent starting point may be chosen for UEs 115 with lower latencyrequirements). For example, the SR starting transmission point may be n,n+4, n+8, etc. for less than or equal to four (4) repetitions or may ben, n+1, n+2, etc. for less than or equal to one (1) repetition, where nrefers to a symbol index. Base station 105-a may choose the startingpoint jointly based on the chosen number and period of SR repetitions.Additionally, the repetitions may cross slot/subframe boundaries.

As a result of choosing the number, period, and starting point for theSR repetitions for UE 115-a, base station 105-a may perform a combineddetection/decoding of a transmitted SR from UE 115-a to improvereliability. For example, a selected SR repetition configuration mayinclude four (4) SR repetitions at starting points n, n+4, n+8, etc.,with one (1) symbol periodicity. If base station 105-a misses the SR atsymbols n and n+1, then at symbol n+2, it can combine the receivedsignal for symbols n, n+1, and n+2 for detecting the transmitted SR fromUE 115-a. Additionally, base station 105-a may perform a combineddecoding if the SR carries information for other purposes. The size ofthe memory utilized to store the repeated SR signals may be small sincea payload size for the SR is small. In some cases, an SR response window(i.e., a time window for UE 115-a to receive a response from basestation 105-a for a transmitted SR) may remain consistent irrespectiveof the chosen repetition parameters.

The power settings may include power boosts to certain repetitions ofthe SR based on channel conditions or based on latency requirements. Forexample, base station 105-a may choose a higher power for certainrepetitions if it is known beforehand that one or more symbols havebetter channel conditions, which may increase reliability. In anotherexample, base station 105-a may boost the SR power when traffic withlower latency requirements is detected. As a result of the lower latencyrequirements, the number of SR repetitions and the size of the SRresponse window may be reduced, and increasing the SR power may serve anequivalent purpose of having more SR repetitions. As opposed to otherpower boosting or ramping procedures (e.g., LTE physical random accesschannel (PRACH) power ramping), base station 105-a may boost the powerbased on the channel conditions or latency requirements instead ofunsuccessful transmission attempts. In some cases, base station 105-amay signal a power setting parameter indicating the power setting viaPDCCH. For example, base station 105-a may signal UE 115-a to transmitan SR in a certain subframe or symbol with a certain power setting(e.g., low, medium, or high power setting). In such cases, bytransmitting the power settings using PDCCH, dynamically changingchannel conditions may be accounted for, and an appropriate power boostmay be utilized by UE 115-a based on various changes in the channelconditions.

The resource allocation parameter may include an indication of whichresources in a time-frequency domain may be used to transmit the SRrepetitions specific to UE 115-a. For example, the resources utilizedfor the SR repetitions may be based off a hopping pattern intime-frequency resources. Additionally or alternatively, the resourcesutilized for the SR repetitions may be allocated in the same or indifferent symbols (e.g., two separate resources for the SR in onesymbol). Additionally or alternatively, the resources utilized for theSR repetitions may be based off cyclic shifts within a resource block.In some cases, base station 105-a may configure the resource allocationfor the SR repetitions for each specific UE 115, including UE 115-a. TheUE-specific resource allocations may randomize the SR repetitivetransmissions. The randomization may reduce collisions with other SRs ofother UEs 115 or uplink control information (UCI) transmissions.Additionally, the randomization may leverage hopping diversity (e.g.,time-frequency diversity), which may improve reliability.

The ACK/NACK procedure parameter may include an indication of how the UE115 should respond when there is a need to transmit an ACK/NACK feedbackin response to URLLC data and an SR in the same symbol. For example, ifboth the ACK/NACK feedback and SR are both urgent, base station 105-amay signal UE 115-a to multiplex the ACK/NACK feedback and SR together.Alternatively, if the SR takes more weight or is more urgent (e.g., norepetition is configured), base station 105-a may signal UE 115-a todrop the ACK/NACK feedback and transmit the SR. Alternatively, if theACK/NACK feedback takes more weight and is more urgent (e.g., a numberof SR repetitions are configured), base station 105-a may signal UE115-a to drop one of the SR repetitions that corresponds to the symbolfor the ACK/NACK feedback.

FIGS. 3A, 3B, and 3C illustrate examples of SR repetition resourceallocation configurations 300, 302, and 304, respectively, that supportUE-specific SR repetitions (e.g., retransmissions) in accordance withvarious aspects of the present disclosure. In some examples, SRrepetition resource allocation configurations 300, 302, and 304 mayimplement aspects of wireless communications systems 100 and 200. It isto be understood that SR repetition resource allocation configurations300, 302, and 304 illustrate examples of possible resource allocationsfor an SR repetition configuration as described with reference to FIG. 2and do not include an exhaustive list of all possible resourceallocations. SR repetition resource allocation configurations 300, 302,and 304 may include a number of frequency resources 305 and symbols 310.

SR repetition resource allocation configuration 300 may include two (2)SR repetitions across the same frequency resources 305-a for two symbols310-a. In the present example, a base station 105 may configure a UE 115to transmit the SR repetitions such that there are two repetitions thatstart at a third symbol 310-a. Additionally, in some cases, differentUEs 115 may utilize the same time-frequency resources as the UE 115. Forexample, the different UEs 115 may utilize the same resource blocks, buteach may utilize a cyclic shift.

SR repetition resource allocation configuration 302 may include four (4)SR repetitions across different frequency resources 305-b for differentsymbols 310-b. In some cases, the resources may be allocated for the SRrepetitions according to a hopping pattern specific to a UE 115. Asdescribed above, the UE-specific resource allocations may randomize theSR repetitive transmissions for each UE 115. The randomization mayreduce collisions with other SRs of other UEs 115 or UCI transmissions.Additionally, the randomization may leverage hopping diversity (e.g.,time-frequency diversity), which may improve reliability.

SR repetition resource allocation configuration 304 may include four (4)SR repetitions across different frequency resources 305-c for two (2)symbols 310-c. A base station 105 may allocate multiple frequencyresources 305-c for SR repetitions within the same symbol 310-c. In somecases, the present example may illustrate one SR repetitionconfiguration with four (4) SR repetitions on four frequency resources305-c for two (2) symbols 310-c. Alternatively, the present example mayillustrate two SR repetition configurations with two (2) SR repetitionseach on two frequency resources 305-c of one (1) symbol 310-c that havedifferent starting periods.

FIG. 4 illustrates an example of a process flow 400 that supportsUE-specific SR repetitions (e.g., retransmissions) in accordance withvarious aspects of the present disclosure. In some examples, processflow 400 may implement aspects of wireless communications systems 100and 200.

In the following description of the process flow 400, the operationsbetween the UE 115-b and base station 105-b may be performed indifferent orders or at different times. Certain operations may also beleft out of the process flow 400, or other operations may be added tothe process flow 400.

At 405, base station 105-b may identify channel conditions associatedwith a UE (e.g., UE 115-b). At 410, base station 105-b may determine anSR repetition configuration for UE 115-b based on the channelconditions. In some cases, the SR repetition configuration may bespecific to UE 115-b (e.g., UE-specific) and also may be based on one ormore of traffic priority for UE 115-b, a UE link budget, a trafficlatency requirement, or historical SR performance.

Additionally, determining the SR repetition configuration UE 115-b mayinclude determining an SR repetition number indicating a maximum numberof SR repetitions by UE 115-b. Additionally or alternatively, basestation 105-b may determine an SR repetition periodicity for UE 115-b totransmit a repetition of an SR. Base station 105-b may further determinea starting symbol period for the UE to transmit a repetition of an SR,the starting symbol period being based on the SR repetition number andthe SR repetition periodicity. In some cases, base station 105-b maydetermine a power configuration for UE 115-b to transmit a repetition ofan SR, the power configuration being based on the channel conditions.The power configuration may include an indication of the transmissionpower for transmitting the repetition of the SR based on an SRrepetition number. Additionally, base station 105-b may configure an SRresource allocation for UE 115-b to transmit a repetition of an SR. TheSR resource allocation may indicate a set of time-frequency resourcesfor the repetition of the SR using a hopping pattern, or a same symbolperiod, or multiple symbol periods, or cyclic shifts in a singleresource block, different radio frequency bands, or any combinationthereof.

At 415, base station 105-b may generate an SR repetition parameter forUE 115-b based on the SR repetition configuration. In some cases, the SRrepetition parameter be based on a traffic priority for UE 115-b, or aUE link budget, or a latency requirement of UE 115-b, or a reliabilityrequirement of UE 115-b, or historical SR performance of UE 115-b, alocation of UE 115-b, or any combination thereof. In some cases, the SRrepetition parameter may include an index of the SR repetitionconfiguration. Additionally or alternatively, the SR repetitionconfiguration may be indicative of the SR repetition number, the SRrepetition periodicity, the starting symbol period, the powerconfiguration, the SR resource allocation, or a combination thereof.

At 420, base station 105-b may transmit the SR repetition parameter toUE 115-b. In some cases, the SR repetition parameter may be transmittedvia RRC messaging or via a PDCCH.

At 425, UE 115-b may transmit a repetition of an SR to the base stationbased on the received SR repetition parameter. Additionally, UE 115-bmay adjust a transmission power for transmitting the repetition of theSR based on the power configuration. For example, UE 115-b may increasethe transmission power for the repetition of the SR in symbol periodsknown by UE 115-b to have a channel condition that satisfies athreshold. In some cases, UE 115-b may transmit the SR during an SRresponse window until a maximum number of SR repetitions is satisfied.Additionally or alternatively, UE 115-b may transmit the SR during an SRresponse window until a resource grant is received from base station105-b. In some cases, UE 115-b may transmit the repetition of the SR inmultiple slots or subframes. In some cases, the repetition of the SR maybe transmitted as part of URLLC. Base station 105-b may receiverepetitions of the SR during the SR response window in accordance withthe SR repetition configuration.

At 430, UE 115-b may identify a collision between a transmission of afeedback message (e.g., ACK/NACK feedback) and the repetition of the SR.Additionally, UE 115-b may determine a priority of the feedback messageand a priority of the repetition of the SR. At 435, UE 115-b maytransmit the feedback message, or the repetition of the SR, or both,based on the priority of the feedback message and the priority of therepetition of the SR.

At 440, base station 105-b may decode the SR based on a combination ofthe received repetitions of the SR. At 445, base station 105-b maytransmit an uplink grant to UE 115-b based on the received SRrepetitions. In some cases, base station 105-b may transmit the uplinkgrant based on a successful decoding of the combination of the receivedrepetitions of the SR.

FIG. 5 shows a block diagram 500 of a wireless device 505 that supportsUE-specific SR repetitions (e.g., retransmissions) in accordance withaspects of the present disclosure. Wireless device 505 may be an exampleof aspects of a UE 115 as described herein. Wireless device 505 mayinclude receiver 510, UE SR repetition manager 515, and transmitter 520.Wireless device 505 may also include a processor. Each of thesecomponents may be in communication with one another (e.g., via one ormore buses).

Receiver 510 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to UE-specificscheduling request repetitions, etc.). Information may be passed on toother components of the device. The receiver 510 may be an example ofaspects of the transceiver 835 described with reference to FIG. 8. Thereceiver 510 may utilize a single antenna or a set of antennas.

UE SR repetition manager 515 may be an example of aspects of the UE SRrepetition manager 815 described with reference to FIG. 8. UE SRrepetition manager 515 and/or at least some of its varioussub-components may be implemented in hardware, software executed by aprocessor, firmware, or any combination thereof. If implemented insoftware executed by a processor, the functions of the UE SR repetitionmanager 515 and/or at least some of its various sub-components may beexecuted by a general-purpose processor, a digital signal processor(DSP), an application-specific integrated circuit (ASIC), anfield-programmable gate array (FPGA) or other programmable logic device,discrete gate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described in thepresent disclosure.

The UE SR repetition manager 515 and/or at least some of its varioussub-components may be physically located at various positions, includingbeing distributed such that portions of functions are implemented atdifferent physical locations by one or more physical devices. In someexamples, UE SR repetition manager 515 and/or at least some of itsvarious sub-components may be a separate and distinct component inaccordance with various aspects of the present disclosure. In otherexamples, UE SR repetition manager 515 and/or at least some of itsvarious sub-components may be combined with one or more other hardwarecomponents, including but not limited to an I/O component, atransceiver, a network server, another computing device, one or moreother components described in the present disclosure, or a combinationthereof in accordance with various aspects of the present disclosure.

UE SR repetition manager 515 may receive, from a base station, a messageincluding an SR repetition parameter for the UE and transmit arepetition of an SR to the base station based on the received SRrepetition parameter.

Transmitter 520 may transmit signals generated by other components ofthe device. In some examples, the transmitter 520 may be collocated witha receiver 510 in a transceiver module. For example, the transmitter 520may be an example of aspects of the transceiver 835 described withreference to FIG. 8. The transmitter 520 may utilize a single antenna ora set of antennas.

FIG. 6 shows a block diagram 600 of a wireless device 605 that supportsUE-specific SR repetitions (e.g., retransmissions) in accordance withaspects of the present disclosure. Wireless device 605 may be an exampleof aspects of a wireless device 505 or a UE 115 as described withreference to FIG. 5. Wireless device 605 may include receiver 610, UE SRrepetition manager 615, and transmitter 620. Wireless device 605 mayalso include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

Receiver 610 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to UE-specificscheduling request repetitions, etc.). Information may be passed on toother components of the device. The receiver 610 may be an example ofaspects of the transceiver 835 described with reference to FIG. 8. Thereceiver 610 may utilize a single antenna or a set of antennas.

UE SR repetition manager 615 may be an example of aspects of the UE SRrepetition manager 815 described with reference to FIG. 8. UE SRrepetition manager 615 may also include SR repetition parametercomponent 625 and SR transmitting component 630.

SR repetition parameter component 625 may receive, from a base stationvia the receiver 610, a message including an SR repetition parameter forthe UE. In some cases, the SR repetition parameter may be indicative ofan SR repetition configuration. In some cases, the SR repetitionparameter may be indicative of an SR repetition number indicating amaximum number of SR repetitions. Additionally or alternatively, the SRrepetition parameter may be indicative of an SR repetition periodicity.In some cases, the SR repetition parameter may be indicative of astarting symbol period to begin transmitting the repetition of the SR,the starting symbol period being based on an SR repetition number and anSR repetition periodicity, where the repetition of the SR is transmittedusing the starting symbol period. In some cases, the SR repetitionparameter may be UE-specific and based on one or more of trafficpriority for the UE, a UE link budget, a traffic latency requirement, orhistorical SR performance. In some cases, the message including the SRrepetition parameter for the UE may be transmitted via a RRC message orvia a PDCCH.

SR transmitting component 630 may transmit a repetition of an SR to thebase station based on the received SR repetition parameter. In somecases, transmitting the repetition of the SR may include transmittingthe SR during an SR response window until a maximum number of SRrepetitions is satisfied. Additionally or alternatively, transmittingthe repetition of the SR may include transmitting the SR during an SRresponse window until a resource grant is received from the basestation. In some cases, transmitting the repetition of the SR mayinclude transmitting the repetition of the SR in multiple slots orsubframes. In some cases, the repetition of the SR may be transmitted aspart of URLLC.

Transmitter 620 may transmit signals generated by other components ofthe device. In some examples, the transmitter 620 may be collocated witha receiver 610 in a transceiver module. For example, the transmitter 620may be an example of aspects of the transceiver 835 described withreference to FIG. 8. The transmitter 620 may utilize a single antenna ora set of antennas.

FIG. 7 shows a block diagram 700 of a UE SR repetition manager 715 thatsupports UE-specific SR repetitions (e.g., retransmissions) inaccordance with aspects of the present disclosure. The UE SR repetitionmanager 715 may be an example of aspects of a UE SR repetition manager515, a UE SR repetition manager 615, or a UE SR repetition manager 815described with reference to FIGS. 5, 6, and 8. The UE SR repetitionmanager 715 may include SR repetition parameter component 720, SRtransmitting component 725, SR configuration index component 730, SRpower configuration component 735, SR resource allocation component 740,and feedback collision component 745. Each of these modules maycommunicate, directly or indirectly, with one another (e.g., via one ormore buses).

SR repetition parameter component 720 may receive, from a base station,a message including an SR repetition parameter for the UE. In somecases, the SR repetition parameter may be indicative of an SR repetitionconfiguration. In some cases, the SR repetition parameter may beindicative of an SR repetition number indicating a maximum number of SRrepetitions. In some cases, the SR repetition parameter may beindicative of an SR repetition periodicity. In some cases, the SRrepetition parameter may be indicative of a starting symbol period tobegin transmitting the repetition of the SR, the starting symbol periodbeing based on an SR repetition number and an SR repetition periodicity,where the repetition of the SR is transmitted using the starting symbolperiod. In some cases, the SR repetition parameter may be UE-specificand based on one or more of traffic priority for the UE, a UE linkbudget, a traffic latency requirement, or historical SR performance. Insome cases, the message including the SR repetition parameter for the UEmay be transmitted via a RRC message or via a PDCCH.

SR transmitting component 725 may transmit a repetition of an SR to thebase station based on the received SR repetition parameter. In somecases, transmitting the repetition of the SR may include transmittingthe SR during an SR response window until a maximum number of SRrepetitions is satisfied. Additionally or alternatively, transmittingthe repetition of the SR may include transmitting the SR during an SRresponse window until a resource grant is received from the basestation. In some cases, transmitting the repetition of the SR mayinclude transmitting the repetition of the SR in multiple slots orsubframes. In some cases, the repetition of the SR may be transmitted aspart of URLLC.

SR configuration index component 730 may indicate an index of an SRrepetition configuration for the UE, based at least in part on the SRrepetition parameter. SR power configuration component 735 may adjust atransmission power for transmitting the repetition of the SR based onthe power configuration. In some cases, adjusting the transmission powerfor transmitting the repetition of the SR may include increasing thetransmission power for the repetition of the SR in symbol periods knownby the UE to have a channel condition that satisfies a threshold. Insome cases, the SR repetition parameter may be indicative of thetransmission power for transmitting the repetition of the SR based on anSR repetition number.

SR resource allocation component 740 may indicate an SR resourceallocation, where the repetition of the SR is transmitted on a set oftime-frequency resources in accordance with the SR resource allocation.In some cases, the SR resource allocation may be indicative oftransmitting the repetition of the SR using a hopping pattern, or a samesymbol period, or multiple symbol periods, or cyclic shifts in a singleresource block, different radio frequency bands, or any combinationthereof.

Feedback collision component 745 may identify a collision between atransmission of a feedback message and the repetition of the SR,determine a priority of the feedback message and a priority of therepetition of the SR, and transmit the feedback message, or therepetition of the SR, or both, based on the priority of the feedbackmessage and the priority of the repetition of the SR.

FIG. 8 shows a diagram of a system 800 including a device 805 thatsupports UE-specific SR repetitions (e.g., retransmissions) inaccordance with aspects of the present disclosure. Device 805 may be anexample of or include the components of wireless device 505, wirelessdevice 605, or a UE 115 as described above, e.g., with reference toFIGS. 5 and 6. Device 805 may include components for bi-directionalvoice and data communications including components for transmitting andreceiving communications, including UE SR repetition manager 815,processor 820, memory 825, software 830, transceiver 835, antenna 840,and I/O controller 845. These components may be in electroniccommunication via one or more buses (e.g., bus 810). Device 805 maycommunicate wirelessly with one or more base stations 105.

Processor 820 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a central processing unit (CPU), amicrocontroller, an ASIC, an FPGA, a programmable logic device, adiscrete gate or transistor logic component, a discrete hardwarecomponent, or any combination thereof). In some cases, processor 820 maybe configured to operate a memory array using a memory controller. Inother cases, a memory controller may be integrated into processor 820.Processor 820 may be configured to execute computer-readableinstructions stored in a memory to perform various functions (e.g.,functions or tasks supporting UE-specific scheduling requestrepetitions).

Memory 825 may include random access memory (RAM) and read only memory(ROM). The memory 825 may store computer-readable, computer-executablesoftware 830 including instructions that, when executed, cause theprocessor to perform various functions described herein. In some cases,the memory 825 may contain, among other things, a basic input/outputsystem (BIOS) which may control basic hardware or software operationsuch as the interaction with peripheral components or devices.

Software 830 may include code to implement aspects of the presentdisclosure, including code to support UE-specific scheduling requestrepetitions. Software 830 may be stored in a non-transitorycomputer-readable medium such as system memory or other memory. In somecases, the software 830 may not be directly executable by the processorbut may cause a computer (e.g., when compiled and executed) to performfunctions described herein.

Transceiver 835 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 835 may represent a wireless transceiver and may communicatebi-directionally with another wireless transceiver. The transceiver 835may also include a modem to modulate the packets and provide themodulated packets to the antennas for transmission, and to demodulatepackets received from the antennas. In some cases, the wireless devicemay include a single antenna 840. However, in some cases the device mayhave more than one antenna 840, which may be capable of concurrentlytransmitting or receiving multiple wireless transmissions.

I/O controller 845 may manage input and output signals for device 805.I/O controller 845 may also manage peripherals not integrated intodevice 805. In some cases, I/O controller 845 may represent a physicalconnection or port to an external peripheral. In some cases, I/Ocontroller 845 may utilize an operating system such as iOS®, ANDROID®,MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operatingsystem. In other cases, I/O controller 845 may represent or interactwith a modem, a keyboard, a mouse, a touchscreen, or a similar device.In some cases, I/O controller 845 may be implemented as part of aprocessor. In some cases, a user may interact with device 805 via I/Ocontroller 845 or via hardware components controlled by I/O controller845.

FIG. 9 shows a block diagram 900 of a wireless device 905 that supportsUE-specific SR repetitions (e.g., retransmissions) in accordance withaspects of the present disclosure. Wireless device 905 may be an exampleof aspects of a base station 105 as described herein. Wireless device905 may include receiver 910, base station SR repetition manager 915,and transmitter 920. Wireless device 905 may also include a processor.Each of these components may be in communication with one another (e.g.,via one or more buses).

Receiver 910 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to UE-specificscheduling request repetitions, etc.). Information may be passed on toother components of the device. The receiver 910 may be an example ofaspects of the transceiver 1235 described with reference to FIG. 12. Thereceiver 910 may utilize a single antenna or a set of antennas.

Base station SR repetition manager 915 may be an example of aspects ofthe base station SR repetition manager 1215 described with reference toFIG. 12. Base station SR repetition manager 915 and/or at least some ofits various sub-components may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions of thebase station SR repetition manager 915 and/or at least some of itsvarious sub-components may be executed by a general-purpose processor, aDSP, an ASIC, an FPGA or other programmable logic device, discrete gateor transistor logic, discrete hardware components, or any combinationthereof designed to perform the functions described in the presentdisclosure.

The base station SR repetition manager 915 and/or at least some of itsvarious sub-components may be physically located at various positions,including being distributed such that portions of functions areimplemented at different physical locations by one or more physicaldevices. In some examples, base station SR repetition manager 915 and/orat least some of its various sub-components may be a separate anddistinct component in accordance with various aspects of the presentdisclosure. In other examples, base station SR repetition manager 915and/or at least some of its various sub-components may be combined withone or more other hardware components, including but not limited to anI/O component, a transceiver, a network server, another computingdevice, one or more other components described in the presentdisclosure, or a combination thereof in accordance with various aspectsof the present disclosure.

Base station SR repetition manager 915 may identify channel conditionsassociated with a UE, determine an SR repetition configuration for theUE based on the channel conditions, generate an SR repetition parameterfor the UE based on the SR repetition configuration, and transmit the SRrepetition parameter to the UE. The SR repetition configuration may beUE-specific and also based on one or more of traffic priority for theUE, a UE link budget, a traffic latency requirement, or historical SRperformance.

Transmitter 920 may transmit signals generated by other components ofthe device. In some examples, the transmitter 920 may be collocated witha receiver 910 in a transceiver module. For example, the transmitter 920may be an example of aspects of the transceiver 1235 described withreference to FIG. 12. The transmitter 920 may utilize a single antennaor a set of antennas.

FIG. 10 shows a block diagram 1000 of a wireless device 1005 thatsupports UE-specific SR repetitions (e.g., retransmissions) inaccordance with aspects of the present disclosure. Wireless device 1005may be an example of aspects of a wireless device 905 or a base station105 as described with reference to FIG. 9. Wireless device 1005 mayinclude receiver 1010, base station SR repetition manager 1015, andtransmitter 1020. Wireless device 1005 may also include a processor.Each of these components may be in communication with one another (e.g.,via one or more buses).

Receiver 1010 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to UE-specificscheduling request repetitions, etc.). Information may be passed on toother components of the device. The receiver 1010 may be an example ofaspects of the transceiver 1235 described with reference to FIG. 12. Thereceiver 1010 may utilize a single antenna or a set of antennas.

Base station SR repetition manager 1015 may be an example of aspects ofthe base station SR repetition manager 1215 described with reference toFIG. 12. Base station SR repetition manager 1015 may also includechannel conditions component 1025, SR repetition configuration component1030, and repetition parameter component 1035.

Channel conditions component 1025 may identify channel conditionsassociated with a UE. SR repetition configuration component 1030 maydetermine an SR repetition configuration for the UE based on the channelconditions. In some cases, the SR repetition configuration may beUE-specific and based on one or more of traffic priority for the UE, aUE link budget, a traffic latency requirement, or historical SRperformance.

Repetition parameter component 1035 may generate an SR repetitionparameter for the UE based on the SR repetition configuration andtransmit the SR repetition parameter to the UE, determine an SRrepetition number indicating a maximum number of SR repetitions by theUE, where the SR repetition parameter is indicative of the SR repetitionnumber, determine an SR repetition periodicity for the UE to transmit arepetition of an SR, where the SR repetition parameter is indicative ofthe SR repetition periodicity, and determine a starting symbol periodfor the UE to transmit a repetition of an SR, the starting symbol periodbeing based on an SR repetition number and an SR repetition periodicity,where the SR repetition parameter is indicative of the starting symbolperiod. In some cases, the SR repetition parameter is based on a trafficpriority for the UE, or a UE link budget, or a latency requirement ofthe UE, or a reliability requirement of the UE, or historical SRperformance of the UE, a location of the UE, or any combination thereof.In some cases, the SR repetition parameter is transmitted via RRCmessaging or via a PDCCH.

Transmitter 1020 may transmit signals generated by other components ofthe device. In some examples, the transmitter 1020 may be collocatedwith a receiver 1010 in a transceiver module. For example, thetransmitter 1020 may be an example of aspects of the transceiver 1235described with reference to FIG. 12. The transmitter 1020 may utilize asingle antenna or a set of antennas.

FIG. 11 shows a block diagram 1100 of a base station SR repetitionmanager 1115 that supports UE-specific SR repetitions (e.g.,retransmissions) in accordance with aspects of the present disclosure.The base station SR repetition manager 1115 may be an example of aspectsof a base station SR repetition manager 1215 described with reference toFIGS. 9, 10, and 12. The base station SR repetition manager 1115 mayinclude channel conditions component 1120, SR repetition configurationcomponent 1125, repetition parameter component 1130, configuration indexcomponent 1135, power configuration component 1140, resource allocationconfiguration component 1145, SR receiving component 1150, and SRdecoding component 1155. Each of these modules may communicate, directlyor indirectly, with one another (e.g., via one or more buses).

Channel conditions component 1120 may identify channel conditionsassociated with a UE. SR repetition configuration component 1125 maydetermine an SR repetition configuration for the UE based on the channelconditions. In some cases, the SR repetition configuration isUE-specific and based on one or more of traffic priority for the UE, aUE link budget, a traffic latency requirement, or historical SRperformance.

Repetition parameter component 1130 may generate an SR repetitionparameter for the UE based on the SR repetition configuration andtransmit the SR repetition parameter to the UE. In some cases,repetition parameter component 1130 may determine an SR repetitionnumber indicating a maximum number of SR repetitions by the UE, wherethe SR repetition parameter is indicative of the SR repetition number.Additionally or alternatively, repetition parameter component 1130 maydetermine an SR repetition periodicity for the UE to transmit arepetition of an SR, where the SR repetition parameter is indicative ofthe SR repetition periodicity. Additionally, repetition parametercomponent 1130 may determine a starting symbol period for the UE totransmit a repetition of an SR, the starting symbol period being basedon an SR repetition number and an SR repetition periodicity, where theSR repetition parameter is indicative of the starting symbol period. Insome cases, the SR repetition parameter may be based on a trafficpriority for the UE, or a UE link budget, or a latency requirement ofthe UE, or a reliability requirement of the UE, or historical SRperformance of the UE, a location of the UE, or any combination thereof.In some cases, the SR repetition parameter may be transmitted via RRCmessaging or via a PDCCH.

Configuration index component 1135 may indicate an index of the SRrepetition configuration. Power configuration component 1140 maydetermine a power configuration for the UE to transmit a repetition ofan SR, the power configuration being based on the channel conditions,where the SR repetition parameter is indicative of the powerconfiguration. In some cases, the power configuration may include anindication of the transmission power for transmitting the repetition ofthe SR based on an SR repetition number.

Resource allocation configuration component 1145 may configure an SRresource allocation for the UE to transmit a repetition of an SR, wherethe SR repetition parameter is indicative of the SR resource allocation.In some cases, the SR resource allocation may indicate a set oftime-frequency resources for the repetition of the SR using a hoppingpattern, or a same symbol period, or multiple symbol periods, or cyclicshifts in a single resource block, different radio frequency bands, orany combination thereof.

SR receiving component 1150 may receive, from the UE, repetitions of anSR during an SR response window in accordance with the SR repetitionconfiguration. SR decoding component 1155 may decode the SR based on acombination of the received repetitions of the SR.

FIG. 12 shows a diagram of a system 1200 including a device 1205 thatsupports UE-specific SR repetitions (e.g., retransmissions) inaccordance with aspects of the present disclosure. Device 1205 may be anexample of or include the components of base station 105 as describedabove, e.g., with reference to FIG. 1. Device 1205 may includecomponents for bi-directional voice and data communications includingcomponents for transmitting and receiving communications, including basestation SR repetition manager 1215, processor 1220, memory 1225,software 1230, transceiver 1235, antenna 1240, network communicationsmanager 1245, and inter-station communications manager 1250. Thesecomponents may be in electronic communication via one or more buses(e.g., bus 1210). Device 1205 may communicate wirelessly with one ormore UEs 115.

Processor 1220 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, processor 1220 may be configured to operate a memoryarray using a memory controller. In other cases, a memory controller maybe integrated into processor 1220. Processor 1220 may be configured toexecute computer-readable instructions stored in a memory to performvarious functions (e.g., functions or tasks supporting UE-specificscheduling request repetitions).

Memory 1225 may include RAM and ROM. The memory 1225 may storecomputer-readable, computer-executable software 1230 includinginstructions that, when executed, cause the processor to perform variousfunctions described herein. In some cases, the memory 1225 may contain,among other things, a BIOS which may control basic hardware or softwareoperation such as the interaction with peripheral components or devices.

Software 1230 may include code to implement aspects of the presentdisclosure, including code to support UE-specific scheduling requestrepetitions. Software 1230 may be stored in a non-transitorycomputer-readable medium such as system memory or other memory. In somecases, the software 1230 may not be directly executable by the processorbut may cause a computer (e.g., when compiled and executed) to performfunctions described herein.

Transceiver 1235 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 1235 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1235 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas. In some cases, thewireless device may include a single antenna 1240. However, in somecases the device may have more than one antenna 1240, which may becapable of concurrently transmitting or receiving multiple wirelesstransmissions.

Network communications manager 1245 may manage communications with thecore network (e.g., via one or more wired backhaul links). For example,the network communications manager 1245 may manage the transfer of datacommunications for client devices, such as one or more UEs 115.

Inter-station communications manager 1250 may manage communications withother base station 105, and may include a controller or scheduler forcontrolling communications with UEs 115 in cooperation with other basestations 105. For example, the inter-station communications manager 1250may coordinate scheduling for transmissions to UEs 115 for variousinterference mitigation techniques such as beamforming or jointtransmission. In some examples, inter-station communications manager1250 may provide an X2 6interface within an LTE/LTE-A wirelesscommunication network technology to provide communication between basestations 105.

FIG. 13 shows a flowchart illustrating a method 1300 for UE-specific SRrepetitions (e.g., retransmissions) in accordance with aspects of thepresent disclosure. The operations of method 1300 may be implemented bya UE 115 or its components as described herein. For example, theoperations of method 1300 may be performed by a UE SR repetition manageras described with reference to FIGS. 5 through 8. In some examples, a UE115 may execute a set of codes to control the functional elements of thedevice to perform the functions described below. Additionally oralternatively, the UE 115 may perform aspects of the functions describedbelow using special-purpose hardware.

At block 1305 the UE 115 may receive, from a base station, a messagecomprising an SR repetition parameter for the UE. The SR repetitionparameter may be UE-specific and based at least in part on one or moreof traffic priority for the UE, a UE link budget, a traffic latencyrequirement, or historical SR performance. The operations of block 1305may be performed according to the methods described herein. In certainexamples, aspects of the operations of block 1305 may be performed by anSR repetition parameter component as described with reference to FIGS. 5through 8.

At block 1310 the UE 115 may transmit a repetition of an SR to the basestation based on the received SR repetition parameter. The operations ofblock 1310 may be performed according to the methods described herein.In certain examples, aspects of the operations of block 1310 may beperformed by an SR transmitting component as described with reference toFIGS. 5 through 8.

FIG. 14 shows a flowchart illustrating a method 1400 for UE-specific SRrepetitions (e.g., retransmissions) in accordance with aspects of thepresent disclosure. The operations of method 1400 may be implemented bya UE 115 or its components as described herein. For example, theoperations of method 1400 may be performed by a UE SR repetition manageras described with reference to FIGS. 5 through 8. In some examples, a UE115 may execute a set of codes to control the functional elements of thedevice to perform the functions described below. Additionally oralternatively, the UE 115 may perform aspects of the functions describedbelow using special-purpose hardware.

At block 1405 the UE 115 may receive, from a base station, a messagecomprising an SR repetition parameter for the UE. The SR repetitionparameter may be UE-specific and based at least in part on one or moreof traffic priority for the UE, a UE link budget, a traffic latencyrequirement, or historical SR performance. The operations of block 1405may be performed according to the methods described herein. In certainexamples, aspects of the operations of block 1405 may be performed by anSR repetition parameter component as described with reference to FIGS. 5through 8.

At block 1410 the UE 115 may transmit a repetition of an SR to the basestation based on the received SR repetition parameter. The operations ofblock 1410 may be performed according to the methods described herein.In certain examples, aspects of the operations of block 1410 may beperformed by an SR transmitting component as described with reference toFIGS. 5 through 8.

At block 1415 the UE 115 may adjust a transmission power fortransmitting the repetition of the SR based on the power configuration.The operations of block 1415 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations ofblock 1415 may be performed by an SR power configuration component asdescribed with reference to FIGS. 5 through 8.

FIG. 15 shows a flowchart illustrating a method 1500 for UE-specific SRrepetitions (e.g., retransmissions) in accordance with aspects of thepresent disclosure. The operations of method 1500 may be implemented bya UE 115 or its components as described herein. For example, theoperations of method 1500 may be performed by a UE SR repetition manageras described with reference to FIGS. 5 through 8. In some examples, a UE115 may execute a set of codes to control the functional elements of thedevice to perform the functions described below. Additionally oralternatively, the UE 115 may perform aspects of the functions describedbelow using special-purpose hardware.

At block 1505 the UE 115 may receive, from a base station, a messagecomprising an SR repetition parameter for the UE. The SR repetitionparameter may be UE-specific and based at least in part on one or moreof traffic priority for the UE, a UE link budget, a traffic latencyrequirement, or historical SR performance. The operations of block 1505may be performed according to the methods described herein. In certainexamples, aspects of the operations of block 1505 may be performed by anSR repetition parameter component as described with reference to FIGS. 5through 8.

At block 1510 the UE 115 may transmit a repetition of an SR to the basestation based on the received SR repetition parameter. The operations ofblock 1510 may be performed according to the methods described herein.In certain examples, aspects of the operations of block 1510 may beperformed by an SR transmitting component as described with reference toFIGS. 5 through 8.

In some cases, transmitting the repetition of the SR includestransmitting the SR during an SR response window until a maximum numberof SR repetitions is satisfied.

FIG. 16 shows a flowchart illustrating a method 1600 for UE-specific SRrepetitions (e.g., retransmissions) in accordance with aspects of thepresent disclosure. The operations of method 1600 may be implemented bya UE 115 or its components as described herein. For example, theoperations of method 1600 may be performed by a UE SR repetition manageras described with reference to FIGS. 5 through 8. In some examples, a UE115 may execute a set of codes to control the functional elements of thedevice to perform the functions described below. Additionally oralternatively, the UE 115 may perform aspects of the functions describedbelow using special-purpose hardware.

At block 1605 the UE 115 may receive, from a base station, a messagecomprising an SR repetition parameter for the UE. The SR repetitionparameter may be UE-specific and based at least in part on one or moreof traffic priority for the UE, a UE link budget, a traffic latencyrequirement, or historical SR performance. The operations of block 1605may be performed according to the methods described herein. In certainexamples, aspects of the operations of block 1605 may be performed by anSR repetition parameter component as described with reference to FIGS. 5through 8.

At block 1610 the UE 115 may transmit a repetition of an SR to the basestation based on the received SR repetition parameter. In some cases,transmitting the repetition of the SR includes transmitting the SRduring an SR response window until a resource grant is received from thebase station. The operations of block 1610 may be performed according tothe methods described herein. In certain examples, aspects of theoperations of block 1610 may be performed by an SR transmittingcomponent as described with reference to FIGS. 5 through 8.

FIG. 17 shows a flowchart illustrating a method 1700 for UE-specific SRrepetitions (e.g., retransmissions) in accordance with aspects of thepresent disclosure. The operations of method 1700 may be implemented bya base station 105 or its components as described herein. For example,the operations of method 1700 may be performed by a base station SRrepetition manager as described with reference to FIGS. 9 through 12. Insome examples, a base station 105 may execute a set of codes to controlthe functional elements of the device to perform the functions describedbelow. Additionally or alternatively, the base station 105 may performaspects of the functions described below using special-purpose hardware.

At block 1705 the base station 105 may identify channel conditionsassociated with a UE. The operations of block 1705 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of block 1705 may be performed by a channel conditionscomponent as described with reference to FIGS. 9 through 12.

At block 1710 the base station 105 may determine an SR repetitionconfiguration for the UE based on the channel conditions. The SRrepetition configuration may be UE-specific and also based at least inpart on one or more of traffic priority for the UE, a UE link budget, atraffic latency requirement, or historical SR performance. Theoperations of block 1710 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations ofblock 1710 may be performed by an SR repetition configuration componentas described with reference to FIGS. 9 through 12.

At block 1715 the base station 105 may generate an SR repetitionparameter for the UE based on the SR repetition configuration. Theoperations of block 1715 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations ofblock 1715 may be performed by a repetition parameter component asdescribed with reference to FIGS. 9 through 12.

At block 1720 the base station 105 may transmit the SR repetitionparameter to the UE. The operations of block 1720 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of block 1720 may be performed by a repetitionparameter component as described with reference to FIGS. 9 through 12.

FIG. 18 shows a flowchart illustrating a method 1800 for UE-specific SRrepetitions (e.g., retransmissions) in accordance with aspects of thepresent disclosure. The operations of method 1800 may be implemented bya base station 105 or its components as described herein. For example,the operations of method 1800 may be performed by a base station SRrepetition manager as described with reference to FIGS. 9 through 12. Insome examples, a base station 105 may execute a set of codes to controlthe functional elements of the device to perform the functions describedbelow. Additionally or alternatively, the base station 105 may performaspects of the functions described below using special-purpose hardware.

At block 1805 the base station 105 may identify channel conditionsassociated with a UE. The operations of block 1805 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of block 1805 may be performed by a channel conditionscomponent as described with reference to FIGS. 9 through 12.

At block 1810 the base station 105 may determine an SR repetitionconfiguration for the UE based on the channel conditions. The SRrepetition configuration may be UE-specific and also based at least inpart on one or more of traffic priority for the UE, a UE link budget, atraffic latency requirement, or historical SR performance. Theoperations of block 1810 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations ofblock 1810 may be performed by an SR repetition configuration componentas described with reference to FIGS. 9 through 12.

At block 1815 the base station 105 may configure an SR resourceallocation for the UE to transmit a repetition of an SR, where the SRrepetition parameter is indicative of the SR resource allocation. Theoperations of block 1815 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations ofblock 1815 may be performed by a resource allocation configurationcomponent as described with reference to FIGS. 9 through 12.

At block 1820 the base station 105 may generate an SR repetitionparameter for the UE based on the SR repetition configuration. Theoperations of block 1820 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations ofblock 1820 may be performed by a repetition parameter component asdescribed with reference to FIGS. 9 through 12.

At block 1825 the base station 105 may transmit the SR repetitionparameter to the UE. The operations of block 1825 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of block 1825 may be performed by a repetitionparameter component as described with reference to FIGS. 9 through 12.

It should be noted that the methods described above describe possibleimplementations, and that the operations and the steps may be rearrangedor otherwise modified and that other implementations are possible.Further, aspects from two or more of the methods may be combined.

Techniques described herein may be used for various wirelesscommunications systems such as code division multiple access (CDMA),time division multiple access (TDMA), frequency division multiple access(FDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and other systems.A CDMA system may implement a radio technology such as CDMA2000,Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000,IS-95, and IS-856 standards. IS-2000 Releases may be commonly referredto as CDMA2000 1×, 1×, etc. IS-856 (TIA-856) is commonly referred to asCDMA2000 1×EV-DO, High Rate Packet Data (HRPD), etc. UTRA includesWideband CDMA (WCDMA) and other variants of CDMA. A TDMA system mayimplement a radio technology such as Global System for MobileCommunications (GSM).

An OFDMA system may implement a radio technology such as Ultra MobileBroadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical andElectronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal MobileTelecommunications System (UMTS). LTE and LTE-A are releases of UMTSthat use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, NR, and GSM aredescribed in documents from the organization named “3rd GenerationPartnership Project” (3GPP). CDMA2000 and UMB are described in documentsfrom an organization named “3rd Generation Partnership Project 2”(3GPP2). The techniques described herein may be used for the systems andradio technologies mentioned above as well as other systems and radiotechnologies. While aspects of an LTE or an NR system may be describedfor purposes of example, and LTE or NR terminology may be used in muchof the description, the techniques described herein are applicablebeyond LTE or NR applications.

A macro cell generally covers a relatively large geographic area (e.g.,several kilometers in radius) and may allow unrestricted access by UEs115 with service subscriptions with the network provider. A small cellmay be associated with a lower-powered base station 105, as comparedwith a macro cell, and a small cell may operate in the same or different(e.g., licensed, unlicensed, etc.) frequency bands as macro cells. Smallcells may include pico cells, femto cells, and micro cells according tovarious examples. A pico cell, for example, may cover a small geographicarea and may allow unrestricted access by UEs 115 with servicesubscriptions with the network provider. A femto cell may also cover asmall geographic area (e.g., a home) and may provide restricted accessby UEs 115 having an association with the femto cell (e.g., UEs 115 in aclosed subscriber group (CSG), UEs 115 for users in the home, and thelike). An eNB for a macro cell may be referred to as a macro eNB. An eNBfor a small cell may be referred to as a small cell eNB, a pico eNB, afemto eNB, or a home eNB. An eNB may support one or multiple (e.g., two,three, four, and the like) cells, and may also support communicationsusing one or multiple component carriers.

The wireless communications system 100 or systems described herein maysupport synchronous or asynchronous operation. For synchronousoperation, the base stations 105 may have similar frame timing, andtransmissions from different base stations 105 may be approximatelyaligned in time. For asynchronous operation, the base stations 105 mayhave different frame timing, and transmissions from different basestations 105 may not be aligned in time. The techniques described hereinmay be used for either synchronous or asynchronous operations.

Information and signals described herein may be represented using any ofa variety of different technologies and techniques. For example, data,instructions, commands, information, signals, bits, symbols, and chipsthat may be referenced throughout the above description may berepresented by voltages, currents, electromagnetic waves, magneticfields or particles, optical fields or particles, or any combinationthereof.

The various illustrative blocks and modules described in connection withthe disclosure herein may be implemented or performed with ageneral-purpose processor, a digital signal processor (DSP), anapplication-specific integrated circuit (ASIC), a field-programmablegate array (FPGA) or other programmable logic device (PLD), discretegate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described herein.A general-purpose processor may be a microprocessor, but in thealternative, the processor may be any conventional processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices (e.g., a combinationof a DSP and a microprocessor, multiple microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope of the disclosure and appended claims. For example, due to thenature of software, functions described above can be implemented usingsoftware executed by a processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations.

Computer-readable media includes both non-transitory computer storagemedia and communication media including any medium that facilitatestransfer of a computer program from one place to another. Anon-transitory storage medium may be any available medium that can beaccessed by a general purpose or special purpose computer. By way ofexample, and not limitation, non-transitory computer-readable media maycomprise random-access memory (RAM), read-only memory (ROM),electrically erasable programmable read only memory (EEPROM), flashmemory, compact disk (CD) ROM or other optical disk storage, magneticdisk storage or other magnetic storage devices, or any othernon-transitory medium that can be used to carry or store desired programcode means in the form of instructions or data structures and that canbe accessed by a general-purpose or special-purpose computer, or ageneral-purpose or special-purpose processor. Also, any connection isproperly termed a computer-readable medium. For example, if the softwareis transmitted from a website, server, or other remote source using acoaxial cable, fiber optic cable, twisted pair, digital subscriber line(DSL), or wireless technologies such as infrared, radio, and microwave,then the coaxial cable, fiber optic cable, twisted pair, DSL, orwireless technologies such as infrared, radio, and microwave areincluded in the definition of medium. Disk and disc, as used herein,include CD, laser disc, optical disc, digital versatile disc (DVD),floppy disk and Blu-ray disc where disks usually reproduce datamagnetically, while discs reproduce data optically with lasers.Combinations of the above are also included within the scope ofcomputer-readable media.

As used herein, including in the claims, “or” as used in a list of items(e.g., a list of items prefaced by a phrase such as “at least one of” or“one or more of”) indicates an inclusive list such that, for example, alist of at least one of A, B, or C means A or B or C or AB or AC or BCor ABC (i.e., A and B and C). Also, as used herein, the phrase “basedon” shall not be construed as a reference to a closed set of conditions.For example, an exemplary step that is described as “based on conditionA” may be based on both a condition A and a condition B withoutdeparting from the scope of the present disclosure. In other words, asused herein, the phrase “based on” shall be construed in the same manneras the phrase “based at least in part on.”

In the appended figures, similar components or features may have thesame reference label. Further, various components of the same type maybe distinguished by following the reference label by a dash and a secondlabel that distinguishes among the similar components. If just the firstreference label is used in the specification, the description isapplicable to any one of the similar components having the same firstreference label irrespective of the second reference label, or othersubsequent reference label.

The description set forth herein, in connection with the appendeddrawings, describes example configurations and does not represent allthe examples that may be implemented or that are within the scope of theclaims. The term “exemplary” used herein means “serving as an example,instance, or illustration,” and not “preferred” or “advantageous overother examples.” The detailed description includes specific details forthe purpose of providing an understanding of the described techniques.These techniques, however, may be practiced without these specificdetails. In some instances, well-known structures and devices are shownin block diagram form in order to avoid obscuring the concepts of thedescribed examples.

The description herein is provided to enable a person skilled in the artto make or use the disclosure. Various modifications to the disclosurewill be readily apparent to those skilled in the art, and the genericprinciples defined herein may be applied to other variations withoutdeparting from the scope of the disclosure. Thus, the disclosure is notlimited to the examples and designs described herein, but is to beaccorded the broadest scope consistent with the principles and novelfeatures disclosed herein.

What is claimed is:
 1. A method for wireless communication at a userequipment (UE), comprising: receiving, from a base station, a parameteror parameters of a plurality of scheduling request (SR) transmission,the parameter or parameters indicating a starting symbol to begintransmitting the plurality of SR transmissions; and transmitting one ofthe plurality of SR transmissions to the base station based at least inpart on the starting symbol.
 2. The method of claim 1, the parameter orparameters indicating a number of the plurality of SR transmissions. 3.The method of claim 1, the parameter or parameters indicating an SRtransmission periodicity.
 4. The method of claim 3, the starting symbolbeing based at least in part on the SR transmission periodicity.
 5. Themethod of claim 3, the transmission periodicity being two symbols. 6.The method of claim 1, the parameter or parameters comprising an indexof an SR configuration for the UE.
 7. The method of claim 1, wherein theparameter or parameters indicating of a power configuration for theplurality of SR transmissions, the method further comprising: adjustinga transmission power for transmitting the plurality of SR transmissions,based on the power configuration.
 8. The method of claim 7, whereinadjusting the transmission power for transmitting the plurality of SRtransmissions comprises: increasing the transmission power for theplurality of SR transmissions in symbol periods known by the UE to havea channel condition that satisfies a threshold.
 9. The method of claim7, the parameter or parameters indicating the transmission power fortransmitting the plurality of SR transmissions based at least in part onan SR repetition number.
 10. The method of claim 1, wherein theparameter or parameters are indicative of an SR resource allocation,wherein the plurality of SR transmissions is transmitted on a set oftime-frequency resources in accordance with the SR resource allocation.11. The method of claim 10, wherein the SR resource allocation isindicative of transmitting the plurality of SR transmissions using ahopping pattern, or a same symbol period, or multiple symbol periods, orcyclic shifts in a single resource block, different radio frequencybands, or any combination thereof.
 12. The method of claim 1, whereintransmitting the plurality of SR transmissions comprises: transmittingthe plurality of SR transmissions during an SR response window until anumber of SR transmissions is satisfied.
 13. The method of claim 1,wherein transmitting the plurality of SR transmissions comprises:transmitting the plurality of SR transmissions during an SR responsewindow until a resource grant is received from the base station.
 14. Themethod of claim 1, wherein transmitting the plurality of SRtransmissions comprises: transmitting the plurality of SR transmissionsin multiple slots or subframes.
 15. The method of claim 1, furthercomprising: identifying a collision between a transmission of a feedbackmessage and the plurality of SR transmissions; determining a priority ofthe feedback message and a priority of plurality of SR transmissions;and transmitting the feedback message, or the plurality of SRtransmissions, or both, based at least in part on the priority of thefeedback message and the priority of the plurality of SR transmissions.16. The method of claim 1, the plurality of SR transmissions being SRrepeating transmissions.
 17. The method of claim 16, the parameter orparameters indicating the SR repeating transmission across a slotboundary.
 18. The method of claim 16, the parameter or parametersfurther indicating a frequency hopping pattern.
 19. The method of claim1, the one of the plurality of SR transmissions comprising multiplexingthe one of the plurality of SR transmissions with an acknowledgement ornegative acknowledgment (ACK/NACK) feedback.
 20. A method for wirelesscommunication at a base station, comprising: generating a parameter orparameters of a plurality of scheduling request (SR) transmissions for aUE, the parameter or parameters indicating a starting symbol of theplurality of SR transmissions; and transmitting the parameter orparameters to the UE.
 21. The method of claim 20, the parameter orparameters indicating a number of the plurality of SR transmissions. 22.The method of claim 20, the parameter or parameters is indicating an SRtransmission periodicity.
 23. The method of claim 22, the startingsymbol being based at least in part on the SR transmission periodicity.24. The method of claim 20, wherein the parameter or parameterindicating a power configuration, the method further comprising:adjusting a transmission power for transmitting the plurality of SRtransmissions, based on the power configuration.
 25. The method of claim20, further comprising: configuring an SR resource allocation for the UEto transmit one of the plurality of SR transmissions, the parameter orparameters indicating the SR resource allocation.
 26. An apparatus forwireless communication, comprising: a memory; a processor coupled to thememory and configured to: receive, from a base station, a parameter orparameters of a plurality of scheduling request (SR) transmission, theparameter or parameters indicating a starting symbol to begintransmitting the plurality of SR transmissions; and transmit one of theplurality of SR transmissions to the base station based at least in parton the starting symbol.
 27. The apparatus of claim 26, the parameter orparameters indicating a number of the plurality of SR transmissions. 28.The apparatus of claim 26, the parameter or parameters indicating an SRtransmission periodicity.
 29. The apparatus of claim 28, the startingsymbol being based at least in part on the SR transmission periodicity.30. The apparatus of claim 26, wherein the parameter or parameterscomprises an index of the SR configuration for the UE.
 31. The apparatusof claim 26, wherein the parameter or parameters indicating a powerconfiguration for the plurality of SR transmissions, the processor beingfurther configured to: adjust a transmission power for transmitting theplurality of SR transmissions, based on the power configuration.
 32. Theapparatus of claim 31, the processor being configured to: adjust thetransmission power for transmitting the plurality of SR transmissionscomprising increasing the transmission power for the plurality of SRtransmissions in symbol periods known by the UE to have a channelcondition that satisfies a threshold.
 33. The apparatus of claim 31,wherein the parameter parameters indicating the transmission power fortransmitting the plurality of SR transmissions based at least in part onan SR number.
 34. The apparatus of claim 26, wherein the parameterparameters indicating an SR resource allocation, wherein the pluralityof SR transmissions is transmitted on a set of time-frequency resourcesin accordance with the SR resource allocation.
 35. The apparatus ofclaim 34, wherein the SR resource allocation is indicative oftransmitting the plurality of SR transmissions using a hopping pattern,or a same symbol period, or multiple symbol periods, or cyclic shifts ina single resource block, different radio frequency bands, or anycombination thereof.
 36. The apparatus of claim 26, the processor beingfurther configured to: transmit the plurality of SR transmissions duringan SR response window until a number of SR transmissions is satisfied.37. The apparatus of claim 26, the processor being further configuredto: transmit the plurality of SR transmissions during an SR responsewindow until a resource grant is received from the base station.
 38. Theapparatus of claim 26, the processor being further configured to:transmit the plurality of SR transmissions in multiple slots orsubframes.
 39. The apparatus of claim 26, the processor being furtherconfigured to: identify a collision between a transmission of a feedbackmessage and the plurality of SR transmissions; determine a priority ofthe feedback message and a priority of the plurality of SRtransmissions; and transmit the feedback message, or the plurality of SRtransmissions, or both, based at least in part on the priority of thefeedback message and the priority of the plurality of SR transmissions.40. The apparatus of claim 26, the plurality of SR transmissions beingSR repeating transmissions.
 41. The apparatus of claim 40, the parameteror parameters indicating the SR repeating transmission across a slotboundary.
 42. The apparatus of claim 40, the parameter or parametersfurther indicating frequency hopping pattern for the SR repeatingtransmissions.
 43. The apparatus of claim 26, the one of the pluralityof SR transmissions comprising multiplexing the one of the plurality ofSR transmissions with an acknowledgement or negative acknowledgment(ACK/NACK) feedback.
 44. An apparatus for wireless communication,comprising: a memory; a processor coupled to the memory and configuredto: generate a parameter or parameters of a plurality of schedulingrequest (SR) transmissions for a UE, the parameter or parametersindicating a starting symbol of the plurality of SR transmissions; andtransmit the parameter or parameters to the UE.
 45. The apparatus ofclaim 44, the parameter or parameters indicating a number of theplurality of SR transmissions.
 46. The apparatus of claim 44, theparameter or parameters indicating the SR transmission periodicity. 47.The apparatus of claim 46, the starting symbol being based at least inpart on the SR transmission periodicity.
 48. The apparatus of claim 44,the parameter or parameters indicating a power configuration, theprocessor being further configured to adjust a transmission power fortransmitting the plurality of SR transmissions, based on the powerconfiguration.
 49. The apparatus of claim 44, the processor beingfurther configured to: configure an SR resource allocation for the UE totransmit one of the plurality of SR transmissions, wherein the parameteris indicative of the SR resource allocation.
 50. The apparatus of claim44, the plurality of SR transmissions being SR repeating transmissions.51. The apparatus of claim 50, the parameter or parameters indicatingthe SR repeating transmission across a slot boundary.
 52. The apparatusof claim 50, the parameter or parameters further indicating a frequencyhopping pattern for the SR repeating transmissions.
 53. The method ofclaim 16, further comprising: dropping an ACK/NACK feedback or an SRrepetition of the SR repeating transmissions based on priorities of theACK/NACK feedback and the SR repetition, the SR repetition being to bein a collision with the ACK/NACK feedback.
 54. The apparatus of claim40, the processor being further configured to: drop an ACK/NACK feedbackor an SR repetition of the SR repeating transmissions based onpriorities of the ACK/NACK feedback and the SR repetition, the SRrepetition being to be in a collision with the ACK/NACK feedback. 55.The apparatus of claim 50, the processor being further configured to:receive an ACK/NACK feedback or an SR repetition of the SR repeatingtransmission based one of the ACK/NACK feedback or the SR repetitionbeing dropped based on priorities of the ACK/NACK feedback and the SRrepetition, the SR repetition being to be in a collision with theACK/NACK feedback.